Flaxseeds should be ground before using, for better digestion. In addition to sprinkling them on cereals, salads, casseroles, and desserts, ground flax can be used in baking to boost nutritional content. Flaxseeds combined with water in a blender become quite viscous and can be used to replace eggs in many recipes. Flax oil is used as a salad oil or can be drizzled over cooked foods. Flax oil is unstable at high temperatures and should not be used as a cooking oil.