Peel the onion and cut into fine cubes. Knead minced meat, egg and breadcrumbs. Season with salt, Tabasco and coriander powder. Form 8 flat meatballs (approx. 60 g). Heat the oil in a pan, fry the meatballs in portions for about 5 minutes each, turning at the same time.
Keep finished meatballs warm. Wash and halve the tomatoes. Stew the tomatoes in the frying fat for about 2 minutes. Add tomato juice and dissolve the roasting mixture. Season to taste with salt. Meanwhile boil up 375 ml salted water for the mashed potatoes.
Remove the pot from the heat. Add milk and stir in the puree flakes with a wooden spoon. Cut avocado in half, remove core. Remove the flesh from the skin with a spoon and mash with a fork.
Add the avocado and lemon juice to the puree and stir briefly. Arrange minced steaks, tomatoes and puree on plates, garnish with coriander.