Where are walnuts found?
Although walnuts can be eaten raw and unprocessed and are sometimes used as a paste, they're also found in foods such as yogurts, pizzas, cakes, salads, biscuits, ice creams, and other desserts. Particularly in Middle Eastern countries, walnuts also are combined with dates, grapes, and almonds to create a cake called mamoul.3
The following items may contain tree nuts and seeds:4 baked goods, baking mixes, barbeque and pesto sauces, cereals, chocolates, pralines, crackers, dressings, gravies, flavored coffees, frozen desserts, muesli, nougats, almond chicken, pad thai, chili and trout amandines and giandujas (i.e., chocolate blended with hazel nuts), marzipans (i.e., almond paste), almond milks, nut milks, tree nut oils, spreads (e.g., cheese spreads and chocolate nut spreads such as Nutella, which contains hazelnuts), vegetarian dishes, Indian curries, Asian dishes, pastas, liqueurs (e.g., amaretto and Frangelico), natural flavorings and extracts (e.g., pure almond extract), salads, trail mixes, and snack foods.
Also note that the words "natural flavors" and "botanicals" may indicate the presence of nuts or nut flavorings.5 Asian restaurants can be especially problematic because they often use nuts and seeds in their cuisine, and since pans may be used for multiple meal preparations, there's an inherent risk for cross-contamination.7
Nonfood items that may contain tree nuts include:4 bean bags, bird seeds, cosmetics, hair care products, sunscreens, massage oils, and pet foods.