Hazelnut/ˈheɪzlnʌt/ Definition 1 of 3Pro Tip 1/3Culinary Uses Hazelnuts are often used in desserts and chocolate for a nutty flavor. She topped the brownies with toasted hazelnuts. Pro Tip 2/3Not Always Whole Hazelnuts can be whole, sliced, ground, or made into paste for different culinary uses. I bought a jar of hazelnut paste for the pastry filling. Pro Tip 3/3Allergy Alert Some people are allergic to hazelnuts; always mention them as an ingredient. The label states that this chocolate contains hazelnuts.