Soak black beans in enough boiling water to cover, for a couple of hours. Drain and rinse.
Place into simmering basket and insert into Thermomix bowl. Fill bowl with enough water to just cover the beans.
Cook 20 min/100ºC/speed 3. Remove beans from bowl and drain bowl.
Place onions, garlic, EVOO, coriander and cumin seeds into Thermomix bowl and chop 4 sec/speed 4. Scrape down sides of bowl and saute 5 min/Varoma/speed 1.
Add remaining ingredients except corn, cooked black beans and garnishes.
Cook 20 min/100ºC/Reverse/speed 2. Add beans and cook 10 min/100ºC/Reverse/speed 2.
Add corn and stir through by hand, just to heat through.
Serve with steamed rice, lime wedges and garnished with feta, avocado and coriander leaves.