Of the nine major food allergens, two are nuts – specifically peanuts (technically a legume), and tree nuts, including almonds, Brazil nuts, cashews, hazelnuts, pecans, pistachios and walnuts. (The others are milk, eggs, fish, crustacean shellfish, wheat, soybeans and sesame.) That’s a lot of ground to cover for people with nut allergies, especially because nuts are a common ingredient in all sorts of sweet and savory recipes.