Cut the tomatoes and mozzarella into thin slices of the same thickness. Arrange the tomato and mozzarella slices interspersed with each other
Preheat the oven to 180˚C. Whisk the egg yolks with a whisk and mustard. Stir in the olive oil until smooth.
Preheat the oven to 180°C. Pour 2tbsp of olive oil into a pan and fry the onion and garlic until the onion is soft.