Place bottoms of rolls on cutting board. Cut rolls in half vertically. Turn rolls cut side up. Trim bottom edge of rolls so that they stand upright. Make a pocket in rolls by making a slit in the cut side, leaving the roll intact on bottom and sides.

Spread 1 tablespoon Avocado–Sour Cream Spread inside each roll. Stuff with roast beef and arugula. Serve immediately.

Avocado–Sour Cream Spread

Makes about 3/4 cup 

1 ripe avocado, peeled and pitted

1/2 cup sour cream

2 tablespoons mayonnaise

2 teaspoons prepared horseradish

1 1/2 teaspoons ranch dip mix

In the work bowl of a food processor, combine avocado, sour cream, mayonnaise, horseradish, and ranch dip mix. Pulse until smooth, scraping sides of bowl as needed. Use immediately.