There are two kinds of people at a sweet counter. Some want a gentle fizz that tickles the tongue and makes them giggle. Others want to pull a face like they’ve licked a lemon and then go straight back for another. If you’ve ever argued over which camp is right, this one’s for you.
I’ll walk you through what’s actually happening in your mouth, the classics worth knowing, a totally unscientific heat scale, and a party game that will leave your guests pulling faces for the next hour.
First, the quick science (no lab coat needed)
Let’s start with the word “sour”. It’s simply the taste of acid. Sweet makers use food acids, mainly citric acid (the sharp stuff in lemons and limes) and malic acid (found in apples, and the reason a green apple sweet makes your cheeks tingle). Malic acid tends to hit slower and linger, while citric acid is a quick, sharp punch.
The classic sour sweet is a normal gummy or jelly rolled in a mix of sugar and acid. That coating is often called sour sanding, because it looks like fine sand. The sugar tempers it a little so the first bite doesn’t feel like a chemistry experiment gone wrong, and then the acid takes over.
And what about fizz?
Fizzy sweets rely on a pretty simple reaction. Sherbet is traditionally made of sugar, bicarbonate of soda and an acid, usually citric or tartaric. Keep it dry and nothing happens. Add spit, and the bicarb and acid react to make carbon dioxide, the same gas in fizzy pop. That’s the tingle, and the little bubbling feeling on the tongue.
So here’s the neat bit: fizzy and sour often work together, but they’re not the same. Fizz is a reaction and a sensation. Sour is a taste. You can have fizz without sourness (a sweet sherbet dip) and sourness without fizz (a plain sour jelly). Many of the best sweets have both.
Fizzy classics worth knowing
- Fizzy cola bottles. A British institution. Chewy, cola-flavoured and rolled in a sugary, slightly tingly dusting. If you’re building a pouch from scratch, these are one of the first things to go in.
- Fizzy dummies. The same fizzy coating, but in a dummy shape. Silly, nostalgic and a big hit with kids.
- Fizzers. The fruity, chalky-looking tablets that fizz on the tongue. Small, cheap and strangely addictive.
- Refreshers. The soft, chewy bars (or their fruity chewy cousins) with a sherbet-style fizz. A fixture of school lunch boxes for decades.
- Sherbet dips and fountains. Strictly more sherbet than fizz, but you get the picture. A bag of sherbet and a lolly to dip into it is peak childhood.
The thing I like about fizzy sweets is that they’re gentle. There’s very little risk of someone bursting into tears, which makes them ideal for younger kids who aren’t ready for the extreme stuff yet.
Sour classics, from cheeky to savage
- Sour strawberries and sour apple belts. The gateway. A good sour belt is soft, long and coated in tangy sugar. You can pull one apart and share it.
- Sour cherries and sour peaches. Slightly mellower than the rest, and brilliant for people who like a little bite but not a lot.
- Toxic Waste. The famous neon sour sweets that come in a barrel. They start extremely sour and then relax into a sweet, fruity centre. The first few seconds are the challenge.
- Warheads-style sweets. Hard sweets with an intense sour coating that eases off after about thirty seconds or so. Genuinely tough, and a rite of passage at certain ages.
- Sour bonbons and sour mix-ups. A decent halfway house if you want variety without the full ordeal.
The very unscientific heat scale
Think of sour sweets a bit like chilli. Here’s my own rating, based on years of enthusiastic (and slightly foolish) tasting. Everyone’s tolerance varies, so treat this as a rough guide.
- Mild tingle: Fizzers, Refreshers, sherbet dips. Basically a hug.
- Gentle fizz with a little zing: Fizzy cola bottles, fizzy dummies, fizzy strawberries.
- Properly sour: Sour belts, sour strawberries, sour cherries. Cheeks begin to scrunch.
- Seriously sour: Sour bonbons with extra sanding, sour mix-ups, sour apple rings. Eyes water slightly.
- Extreme: Toxic Waste and Warheads-style hard sours. Not for the faint-hearted.
Start at level one and work your way up, rather than diving in at five and getting put off sour sweets for life.
Why kids (and plenty of adults) love them
It’s partly the thrill. Sour and fizzy sweets create a sensation that’s slightly daring but safe. It’s a bit like a rollercoaster, where your face does a funny thing and then you want to do it again. It’s also a social thing. Pulling a face is a performance, and seeing your friend’s reaction is half the fun.
There’s a nostalgia angle too. A lot of adults who grew up on sherbet and fizzy cola bottles are now buying them for their own children, and a good number of them are still sneaking handfuls out of the bag.
Picking the right sweets for the right moment
If you’re shopping, a shelf of fizzy sweets is the best place to start when you’re feeding a mixed crowd, because nearly everyone can handle a gentle tingle. The softer, bubbly ones also work well in party bags where you can’t predict who’s going to turn their nose up at something too intense.
For those who want a proper kick, a collection of sour sweets is where you’ll find the belts, bonbons and neon-coated gummies that give you the real face-scrunching experience. Pick two or three you fancy and sample them side by side, because the difference between a gentle sour and a savage one is bigger than you’d think.
Pairing tips
Tongue-tingling sweets love a partner. A few combinations that work:
- Sour and creamy. A sour belt followed by a marshmallow or a bit of fudge is a lovely contrast. The sweetness calms everything down.
- Fizzy and chewy. Pop a fizzy cola bottle alongside a fruit-flavoured chew for different textures in one bite.
- Sour and chocolate. Controversial, but a sour strawberry with a piece of milk chocolate is oddly good.
- Cleanse the palate. A few plain boiled sweets or a sip of water between sours stops your tongue getting numb.
- Mix levels in a pouch. If you’re making a pick n mix, add a few mild sweets to balance the extreme ones, otherwise the bag will empty in a very lopsided way.
One more trick: temperature changes things. A sour sweet straight from a cold cupboard feels a bit less intense than one that’s been warmed in your hand, because softer sugar dissolves faster and releases its acid sooner. If you want to ease someone in gently, serve the sours cold. If you’re setting up a challenge, keep them at room temperature and let the mouth do the rest.
Texture matters too. A hard sour sweet releases its acid slowly and keeps going for ages, while a soft sour belt delivers the hit in the first bite and then settles. That’s why a lot of people who can’t cope with a hard sour will happily munch through a bag of belts without a flinch.
A bit of tooth-care common sense
I’m not going to pretend sweets are good for your teeth. Sugar plus acid is tougher on enamel than sugar alone, so it’s worth a few sensible habits.
- Eat sweets in one sitting rather than nibbling all afternoon.
- Rinse your mouth with water afterwards.
- Wait a little while before brushing, as brushing straight after acid can be rough on softened enamel.
- Keep the very sour stuff for treats rather than daily habit.
That’s not a lecture, just the kind of thing a dentist would nod at. Enjoy them, and look after your teeth.
The sour challenge party
Here’s a game that works brilliantly at kids’ parties, teenage sleepovers and even adult get-togethers.
What you need: A selection of sour sweets from mild to extreme, small bowls, a timer, water and a bin for the brave who tap out.
How to play:
- Put out five bowls, labelled one to five by sourness.
- Each player picks a bowl and must keep the sweet in their mouth for 30 seconds without pulling a face, or at least without spitting it out.
- Players earn a point for each level they complete. Level five is worth double.
- Keep a scorecard, and let everyone vote on the best face of the night.
- Finish with a “cool-down” round of marshmallows or fizzy sweets so everyone ends up smiling.
A word of caution: for younger children, skip the extreme level and supervise properly. Hard sweets can be a choking hazard for the very small, and nobody should be forced to take part.
And if you’re running the game with adults, add a forfeit round. Whoever pulls the best face wins a bag of something sweet and gentle, and whoever taps out first has to hand round the water. Keep a phone handy, because the photos are always the best bit.
Your next tongue-tingler
Whichever side you pick, there’s no wrong answer. Fizzy is the friendly one, sour is the dramatic one, and the best bag has a bit of both. Grab a handful, start at the mild end, and see how far up the scale you can go before your face gives you away.