My favorite meal when I invite a group of people for dinner! It allows each person to put what he wants on his plate.
It is also a meal that doesn't scare the less accustomed veganism. Burritos, everyone eats that!
To make vegan burritos, I put:
Beans (I used black beans, it could also be red beans, to your taste!) or beefless ground (I use the brand Yves, available in all grocery stores)
Peppers & Onions (which you can cook in the pan with olive oil)
Avocado or guacamole