Peel the onions. Wash and seed the tomatoes and dice them finely. Chop the jalapeños. Mix half onions, tomatoes, jalapeños and lime juice, crush a little with a fork. Season with salt and pepper.
Dab meat dry. Fry in hot oil for about 5 minutes, turning, salt and remove. Fry the rest of the onion in the frying fat for approx. 5 minutes, deglaze with 3 tbsp water. Wash and chop parsley. Chop the meat finely.
Mix with onions, season with salt, pepper and cumin. Spread the meat, salsa and parsley into the tacos.