Sure, here’s a simple recipe for a vegetarian burrito filling that should work perfectly for you. It yields enough filling for eight large burritos.

Ingredients:

1. 400 grams of vegetarian chicken substitute
2. 300 grams of organic brown rice
3. 1 large red onion (approximately 150 grams)
4. 2 cloves of garlic
5. 400 grams of canned black beans
6. 2 large red bell peppers (approximately 300 grams)
7. 200 grams frozen corn
8. 20 grams of fresh coriander
9. 2 teaspoons of ground cumin
10. Salt and pepper to taste
11. 2 tablespoons of olive oil (approximately 30ml)
12. 2 limes (for juice)
13. 400 grams of canned chopped tomatoes

Instructions:

1. Start by cooking the brown rice according to the instructions on the packet and then set it aside.

2. Heat the olive oil in a large skillet over medium heat. Add the chopped onion and garlic to the skillet and sauté them until they begin to soften.

3. Add the vegetarian chicken substitute to the skillet and cook it until it’s thoroughly heated.

4. Add the chopped red bell peppers, canned black beans (drained and rinsed), and frozen corn to the skillet. Stir everything together and let it cook for a few minutes.

5. While that’s cooking, chop up the fresh coriander. Add the coriander to the skillet along with the ground cumin, salt, and pepper. Also, add the juice from the two limes. Mix everything together well.

6. Finally, add the cooked rice and canned chopped tomatoes to the skillet. Stir everything together and let it cook for another few minutes until everything is heated through.

You now have a tasty vegetarian filling for your burritos! You can serve it in a large tortilla with some shredded lettuce, avocados, salsa and a bit of shredded cheese (optional) if you like. Enjoy!