The nutmeg tree (myristica fragrans) is the only tree that produces two separate spices. The fruit contains a hard pit known as nutmeg, while the lacy red membrane surrounding it is mace. Mace spice is a common ingredient in Northern European cooking, appearing in hearty vegetable dishes, cream sauces, and sausages. In baking, ground mace spice can be used as a substitute for nutmeg; its mellower flavor is especially nice with fruits or delicate pastries. It’s also delicious in pumpkin pie or baked winter squash dishes.