* As I told you, choose any fruit you like, the possibilities are endless! Pear, banana, pineapple, grapes, all kinds of red fruit (fresh or frozen). Feel free to experiment! I always like to use a ‘firmer’ piece of fruit (like a nectarine or an apple) for chewiness, but that is not necessary at all.
** I like a bit of a sour note, so I use some lemon juice. It also makes for cooking fluid, to help cook the fruit. If the fruits you’re using are sour themselves, then maybe skip the lemon juice. If possible, then replace the spoonful of syrup with some sugar or fructose. The kernels will help pull out moisture, speeding along the cooking process.
Tip: The crumble is lovely to serve hot, warm or cold, with some (soy) yoghurt or ice cream.