A cold glass of lemonade is great on its own, but fancy-flavoured lemonade is another level of tastiness that can be as easy as adding in a spoonful of your favourite jam.
Image from maria_keays.
Ideally you'll spoon in your jam while you're making your lemonade, so you can taste it, see how it is and then add a little more if you need it, or dilute it a bit with water. If you've already made some lemonade though, you can still boost its flavour by adding the jam before you serve.
Just about any jam will work as long as you like the flavour and it works with the tartness of the lemonade, but The Kitchn specifically suggests fig, cherry, raspberry, or strawberry jam since the flavours work well with citrus.
If you don't want to add a lot of extra sweetness to your lemonade, consider a sugar-free jam, or just a simple fruit puree. If you add it while you make your lemonade, you can compensate for a sweeter jam with a little less sugar or sweetener in your lemonade recipe. It's a simple trick that can make a refreshing drink even better.
3 Ways to Fancy Up Lemonade with 1 Ingredient [The Kitchn]