World's Best Roast Beef Sandwiches

Makes 4.

8 slices dark rye bread
Lots of butter
1/2 cup dairy sour cream
2 teaspoons dry onion soup mix
2 teaspoons prepared horseradish, well drained
Dash of freshly ground pepper
Thinly sliced cold roast beef
Lettuce

Spread bread slices with butter. Combine sour cream with onion soup mix, horseradish and pepper. Spread about 1 tablespoon of this mixture on each slice of bread. Top four slices lavishly with roast beef, then lettuce; cover with remaining bread. You may need cocktail picks or wooden picks to hold each half of the sandwich together.