A dessert spoon is the middle size. Tablespoons are larger and are most commonly used for serving or mixing, râ¦ather than eating. A dessert spoon used as a unit of measurement is two teaspoons, and a tablespoon used as a unit of measurement is three teaspoons, thus a tablespoon is 1.5 dessert spoons. Teaspoon = approx. 5 ml Dessertspoon = approx. 10 ml Tablespoon = approx.