Black Bean Burgers - Cooking like a Boss

3 ³⁄₈ red onion

9 soft rolls	sliced	spread on both sides						layer
9 tablespoons 0.135 l 135 ml 27 tsp 0.571 cup 0.238 pint natural yoghurt
¹⁄₂ of the salsa
2 ¹⁄₄ mango	destone and finely slice
2 ¹⁄₄ avocado	destone and finely slice
9 sprigs of fresh coriander
burgers
preheat oven to 200*c						roast for 25 minutes	add then keep in oven for 5 more minutes
2 ¹⁄₄ red onion	blend until fine	pulse	shape into 9 burgers	rub all over	dust
450 g 0.45 kg 0.992 lb 15.9 oz mixed mushrooms
225 g 0.225 kg 0.496 lb 7.94 oz rye bread
2 ¹⁄₄ teaspoon 0.011 l 11 ¹⁄₄ ml ³⁄₄ tbsp 0.048 cup 0.02 pint ground coriander
900 g 0.9 kg 1.98 lb 31.7 oz tin of black beans	drain
salt
pepper
oil
ground coriander
90 g 0.09 kg 0.198 lb 3.17 oz mature Cheddar	grated
remaining salsa