Wash the meat, cut the fat edge with a sharp knife. Heat 2 tablespoons of oil in an ovenproof pan. Brown the meat in it for 1 minute on each side. Place the pan in the preheated oven (electric cooker: 200 °C/ convection oven: 175 °C/ gas: level 3).
Fry the meat for about 10 minutes. Peel onion and garlic and chop finely. Heat 3 tablespoons of oil in a pan. Fry half of the onion and garlic in it. Add tomatoes and tomato paste and bring to the boil.
Drain the beans, rinse and add to the tomato sauce. Wash the mint and chop coarsely except for a little to garnish. Add half to the tomato sauce and simmer for about 5 minutes. Mix lemon zest, remaining onion and rest of mint.
Take the meat out of the oven, season with salt and pepper, let it rest for a while. Season tomato sauce with salt and pepper. Cut meat into slices. Arrange white beans in mint tomato sauce with meat on a plate.
Sprinkle with Gremolata and garnish with mint.