A hearty sandwich loaded with slices of roast beef, creamy horseradish sauce, sharp cheddar, and crisp lettuce tucked into toasted rolls. The combination of tender beef, tangy sauce, and fresh crunch creates a satisfying, flavor-packed meal.
Store leftover sandwich components separately in airtight containers in the refrigerator for up to 3 days. The horseradish sauce can be made up to 2 days ahead. To reheat leftover beef, place it in a skillet over low heat with a splash of beef broth to keep it moist, or microwave on medium power in 30-second intervals. Toast rolls again briefly if they have softened. Sliced roast beef from the deli counter is best, but you can use leftover homemade roast beef; slice it thinly against the grain.
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