What can I use if I don't have a food processor?

You can do a lot with a knife. You can chop and dice to the size you want. It's a bit more time consuming than using a food processor or something else, but a knife is one thing that everybody would have in a kitchen. If you need your ingredients minced or chopped finely, you could use a box grater or microplane. You have those different sides, so you could use a slicing tool. That would be good, if you wanted a fine grate or chop. Lina often uses her manual chopper for things like onions and carrots. They're really handy. It's a great cheap alternative.