Peel and mash the garlic. Add egg yolk, salt and pepper and stir in the olive oil slowly and regularly to give the sauce volume (like with a mayonnaise) – sprinkle some lemon juice on top. This sauce can be served with fish dishes or cold meat (veal, beef, chicken). But it can also be enjoyed as a dish on its own. Cook potatoes, green beans, beets as you like – or eggs, mussels, a whiting. Present the whole thing with tomatoes and serve the aioli sauce in a sauce boat.