Preheat oven (electric cooker: 200 °C/circulating air: 175 °C/gas: see manufacturer). Wash chicken fillets and pat dry. Heat 1 tablespoon of oil in a large frying pan. Brown the fillets in it all around for about 3 minutes.
Season with salt and pepper. Take it out.
Wash the tomatoes, cut them in half and put them into a large greased casserole dish. Sprinkle with 3 tablespoons of oil. Season with salt and pepper. Place the meat on the tomatoes.
Knead butter, herbs, egg yolk, breadcrumbs and tomato paste. Season with salt, pepper and lemon juice. Spread the breadcrumb mixture over the meat and bake in a hot oven for 12-15 minutes until golden brown
Remove and serve immediately.