Clean the beans and boil them in salted water for about 7 minutes, then rinse with cold water. Wash and halve the cherry tomatoes. Cook rice in boiling salted water according to package instructions. Wash lemon, grate dry and cut in half. Cut one half into corners, squeeze the other half.
Wash basil, dab dry and put some leaves aside for garnishing. Roughly chop the remaining leaves. Crush mustard seeds. Heat 2 tablespoons of oil in a pan. Add mustard seeds and lemon wedges and fry for 1-2 minutes. In the meantime, wash the plaice fillets, dab dry and season with salt, pepper and lemon juice. Add tomatoes, mustard, beans, basil and olives to the lemon wedges. Heat 1 tablespoon of oil in another pan and fry the plaice fillets for 3-4 minutes, turning them once. Season vegetables with salt and pepper and arrange them with the plaice fillets.
In the meantime, wash the plaice fillets, dab dry and season with salt, pepper and lemon juice. Add tomatoes, mustard, beans, basil and olives to the lemon wedges. Heat 1 tablespoon of oil in another pan and fry the plaice fillets for 3-4 minutes, turning them once. Season vegetables with salt and pepper and arrange them with the plaice fillets. Garnish with basil. Serve with rice