Food & Cooking Recipes Appetizers Smoked Trout and Avocado Mousse in Endive Close Credit: Burcu Avsar Yield: 20 Use a pastry bag to pipe the silky avocado mousse into the endive leaves for a beautiful presentation. Directions Pulse avocado with lemon juice until smooth. Season with salt and pepper. Transfer mousse to a pastry bag fitted with a small round tip. Pipe mousse into endive and flake trout onto them. Garnish with scallion.