Tofu can be used in many different ways. It can be wet or dried. It can be fried. It can serve as a substitute more meat in many dishes, and provide protein.
Tomatoes are good. For example salads, as a base for sauces and soups are very widely available in different parts of the world, and of course, are something I find delicious. I also enjoy tomato juice.
Potatoes are very filling and commonly grown all over the world. They're very easy to get things like French fries, or baked potatoes in different countries. You can also make potato soup and have it as a filling part of your meal.
Rice is very good to serve as the base for many dishes. For example risotto, or paella or fried rice or curry. It's the filling part of a lot of dishes around the world as a staple grain which is quite easy to grow in many parts and is commonly eaten.
Garlic is often very good for giving flavor to what might not be such an interesting dish. By chopping up some garlic and throwing it in a dish, you can be sure your rice dish or pasta dish, or something, will have some good flavor, and it's very healthy for you.
And as a fruit, I like bananas. Maybe bananas don't have a lot of use in cooking, but you can certainly become full by eating them. Banana sandwiches can be quite good, or you can use them to make fruit juice shakes or as part of a fruit salad.
So those aren't necessarily my favorite foods, but those are six things I find myself eating many times in different parts of the world in order to feel full and have the energy and go and do some activities.