Peel the vegetable onion and cut into very fine slices. Clean and sanitize the mushrooms. Peel garlic and press it through a garlic press. Dice bacon finely. Heat 3 tablespoons of oil in a large frying pan, leave the bacon crisp and remove. Fry the mushrooms in hot fat in two portions until golden brown. Finally add garlic, fry briefly and season with salt, pepper and thyme.
Add bacon and deglaze with vinegar and broth. Mix in olive oil, put everything in a bowl and fold in the onions. Let it cool down. Peel the mangos, cut the flesh off the stone and dice. Clean and wash the radicchio and romaine lettuce and drain well. Cut radicchio into very fine strips, romaine lettuce into slightly wider strips. Mix the mango and lettuce strips with the mushrooms, season again with salt and pepper and arrange in cups or on small plates