Yes they can be used for cooking, just search crabapple recipes on the internet and you will find a some good info.
Crabapples and pork chops, crabapple marmalade, crabapple pie are a few things you can do.
I like them raw :)
The lemon is a fruit and used for culinary and non culinary purposes
In cooking as a vegetable
It is a fruit, for culinary purposes it is a vegetable
It is classed as a vegetable but for culinary purposes it is a fruit
Cucumbers are fruits, but for culinary purposes they are vegetables
Botanically it is a fruit, but for culinary purposes it is a vegetable
courgette is a fruit, for culinary purposes it is a vegetable
botanically speaking they are fruits. For culinary purposes they are vegetables
They are fruits, but for culinary purposes are treated as vegetables
It is a fruit. For culinary purposes it may be a vegetable
Tomatoes are fruits, but for culinary purposes they are used as vegetables
A cucumber is a fruit, but for culinary purposes it is used as a vegetable