Vegetables are cut into strips, potatoes larger cubes. Carrots, peppers, beans and sauté the onion in a little sunflower oil, part of the butter and water. Should remain slightly crunchy. Pour into a bowl and stir in the remaining butter. Cook potatoes with broth and thyme and pour in the middle. A may be mixed with other vegetables. Serve with sauce. Boiled mayonnaise: The yolk is mixed with flour and 150 ml water. Mix well and put on low heat to thicken, stirring constantly. Then add other products.