Spray counter lightly with non-stick cooking spray. Combine rolls into a ball. Roll into a 16 inch circle. Place on a 15 inch sprayed pizza pan. Poke several times with a fork to prevent bubbles from forming. Bake at 400°F 10 minutes. Remove from oven. Spread with pesto.
Sprinkle with 1-cup cheese. Top with shrimp and tomatoes. Sprinkle with remaining cheese, onion, and pepper flakes. Bake at 400°F 10-15 minutes.
2 cups lightly packed fresh basil leaves
1/2 cup olive oil
1 cup Parmesan cheese
1 clove garlic, minced
Place all ingredients in blender. Blend until smooth, adding more oil if needed. (If made ahead, cover and chill up to 5 days, or freeze.) Makes 1 1/2 cups.