Commercial sherbet generally contains dairy as well as ingredients made from allergens such as corn and soy. This lemon ice has only 3 ingredients including sugar and water. If you're o.k. with citrus, this lemon ice is safe.
It is also intensely lemony and not overly sweet.4 cups sugar (See Sugar in the Glossary)
2 cups water
4 cups fresh squeezed lemon juice (See Juice in the Glossary)