Place a flour tortilla on a sheet of plastic wrap. Brush lightly both sides of the tortilla with water. Combine salad dressing with mustard according to your taste (1/2 cup mayonnaise - 2 teaspoons mustard). Spread 1 side generously with this mixture. Top with:

Shaved roast beef or turkey
Slices of cheese (roast beef-Swiss, turkey-colby)
Sliced ripe or green olives
Grated carrots
Spinach or lettuce leaves
Alfalfa sprouts

To within 1/2 inch of the edge roll up securely in plastic wrap. Refrigerate 4 hours or overnight. In serving unwrap and cut tortilla in half.