My son is allergic (like the anaphylatic reaction kind) to dried beans. He can eat canned beans with no problems and has never had a problem with store bought hummus. His preschool teachers and I are trying to figure out if there is any hummus he could have a problem with and therefore sit at a separate table. Can you make hummus without cooking the garbanzo beans first? Could you just used roasted? I always use canned when I make hummus but because he may have a problem with roasted, I need to know if it's possible to make hummus with roasted.