Zippy Roast Beef Sandwich

• 8 slices rye bread
• butter
• 1/2 cup sour cream
• 2 teaspoons dry onion soup mix
• 2 teaspoons prepared, well-drained horseradish
• dash pepper
• thinly sliced chilled roast beef
• lettuce leaves

Spread butter on bread slices. In a small bowl, combine sour cream, soup mix, and horseradish and pepper. Spread about a tablespoon of the sour cream mixture over each of the 8 slices of bread. Top 4 slices of bread with roast beef slices, then a few lettuce leaves. Cover with remaining slices of bread.
Makes 4 sandwiches.