Defrost the sardines, then cut them slightly several times. Wash the pepperoni. Wash 1 lemon, grate peel, squeeze juice. Peel the garlic and press it through the garlic press. Mix garlic, lemon peel, pine nuts and breadcrumbs. Season with salt and pepper. Place the sardines and peppers on a baking tray lined with baking paper.
Drizzle both with olive oil and lemon juice. Sprinkle sardines with prepared mixture. Cook in the preheated oven (electric cooker: 225 ° C/ gas: level 4) for about 8 minutes. In the meantime, peel the onion and cut into fine slices. Wash the remaining lemons, also cut into slices. Wash the basil and pluck the leaves. Serve sardines, chilli peppers, onions and lemon wedges sprinkled with basil