Broccoli and Cauliflower Gratin Mac n Cheese

INGREDIENTS

• 1/3 cup finely chopped chives
• A few drops hot sauce
• Freshly ground black pepper
• 1 pound whole-wheat macaroni or penne or other short cut pasta
• 2 cloves garlic, peeled and grated or crushed into paste
• 1 tablespoon Dijon mustard
• 1 small head or bundle broccoli, trimmed into florets
• 1 small head cauliflower or half a large head, trimmed and cut into florets
• 2 1/2 cups grated extra-sharp Cheddar
• Salt
• 2 cups sour cream or reduced-fat sour cream