For the filling, peel the onions and cut them into slices. Peel the garlic and press it through the garlic press. Rinse the beans and let them drain. Wash parsley and cut into fine strips. Heat the oil in a pan. Fry onions and garlic in it until golden brown. Add beans and chilli sauce.
Bring to the boil. Season to taste with salt, lemon juice and some pepper. Fold in parsley. Heat tacos in the preheated oven (electric cooker: 175°/ gas: level 2) for five minutes. Add the filling. Serve garnished with lemon slices and a small bunch of herbs