Preparing a delicious dessert with Dr. Oetker Lemon Mousse Powder is quick and easy The powder is whisked in to cold water, and the mousse is ready to serve in about an hour. A richer result can be achieved by using milk instead of water. For a festive dessert, portion the ready Mousse into serving bowls and decorate with fresh berries, fruits, or chocolate decorations. The Lemon Mousse powder is packed in a convenient 80 g pouch. One pouch of Lemon Mousse powder makes 4 servings.