Can I use "我知道“ to say I know some kind of food?
Usually don't use 我认识 on food, if someone ask you whether you know of some kind of food, if you have eat it once or more, you can say 我吃过那个. or if you ever heard of it, you can say 我听说过，但是没吃过. If you want to eat, you can say 我们可以吃吃, if you don't, just say 我不想吃 or 我不喜欢吃那个.
If you are on table, and someone show you a kind of food, and ask you do you know it, he may ask you 你知道这道菜是什么吗？Then you can say 我知道 or 我不知道，and 我认识 or 我不认识 can also use here. But, this is not a polite action, man usually don't ask others not close enough for this sentence. Ask for 吃过这道菜没有 is a more common question.