1 Blanch the tomatoes in boiling water for a few seconds, then refresh in cold water, skin and slice. Drain and slice the mozzarella. Halve the olives. Peel the garlic clove.
2 Rub the slices of bread with the garlic clove and sprinkle with a little oregano. Then top first with mozzarella, then with tomato slices and olives. Sprinkle with salt, pepper and oregano.
3 Line a baking tray with baking parchment. Lay the prepared crostini on the tray and bake in an oven preheated to 180°C (160° fan) | 350F | gas 4 for about 10 minutes.