Roast Beef Sandwiches with Caramelized Onion and Horseradish Mayonnaise
- Mix together mayonnaise and Horseradish Dill Blend and set aside. Heat Natural Grapeseed Oil in a skillet over medium-high heat and sauté onions for 15-20 minutes, stirring occasionally, until onions are soft and golden brown. Spread mayonnaise mixture on each slice of bread. Assemble sandwiches by layering 2 slices roast beef, onions, and tomato slices between two slices of bread.