Corned Beef Tea Sandwiches with Mustard Butter. Traditionally, tea sandwiches are dainty little bites, but these triple stack Corned Beef Tea Sandwiches, made with hearty oatmeal bread, are enough to make a meal. Mustard Butter Recipe, Tea Recipes, Cooking Recipes, Tea Sandwich Recipes, Cooking Tips, Sandwich Platter, Picnic Recipes, Dishes Recipes, Breakfast Recipes