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Lamello Top biscuit joiner with blade extended. Edges of 16mm Medium-density fibreboard with a #0 biscuit, set up to make a right angle joint. A biscuit joiner (or sometimes plate joiner) is a woodworking tool used to join two pieces of wood together. A biscuit joiner uses a small circular saw blade to cut a crescent-shaped hole (called the mouth) in the opposite edges of two pieces of wood or wood composite panels. An oval-shaped, highly dried and compressed wooden biscuit (beech or particle wood) is covered with glue, or glue is applied in the slot.
One of the key differences in the biscuit mixing method and the muffin mixing method is that for the biscuit method you use solid fat, almost always cold solid fat, and the muffin method you will use a liquid fat. For these biscuits we are using very cold, real, unsalted butter cut into small pieces. In general, when using The Biscuit Mixing Method you want your fat and your liquids very cold. 2  In general, when using The Muffin Mixing Method you want your fat and liquids at room temp (or slightly warm if your fat is melted butter).