Bitter Girl Go Walnuts Bitters contain walnuts. Nutmeg seed was originally processed in a facility that contains peanuts, tree nuts, soy, milk, wheat, and sesame seeds, with all products processed and packed based under Good Manufacturing Practices (GMPs) and HACCP (Hazard Analysis and Critical Control Points). Most items in Sother’s classic rum spice mix were originally processed on equipment shared with peanuts, tree nuts, wheat, milk, soy, eggs, and sesame.