I’m not a vegetarian, and I’m not completely familiar with vegetarians “rules,” but I think this tostada complies.
Here’s a tostada that I had for lunch this weekend, and it tasted as good as it looked!.
2nd layer — homemade refried beans (reheated after thawing. I make them often and freeze them in 1-2 cup portions)
3rd layer — homemade guacamole made with avocado, garlic, chopped onions and salt
4th layer — chopped tomatoes
This is a recipe that you can have fun with — add other veggies that you have, sprinkle on some shredded cheese (although definitely not necessary) or whatever sounds good to you!