Place slices of bread on a baking tray and sprinkle with oil. Roast in a preheated oven (electric cooker: 200 °C/ circulating air: 175 °C/ gas: see manufacturer) for 5-7 minutes.
Peel and finely chop the garlic. Wash the chives, shake dry and cut into fine rings. Wash lemon, grate dry and grate peel. Halve lemon and squeeze juice. Mix ricotta, 1 tbsp. lemon juice, garlic and chives, except for a little to garnish.
Season to taste with salt and pepper.
Halve the avocados, remove the seeds, peel the flesh and cut into large pieces. Spread the breads with ricotta, spread the avocado on top. Sprinkle with chives and lemon peel and garnish with rocket.