To make Caesar dressing, combine yogurt, ½ cup cheese, 2 tablespoons milk, oil, Worcestershire, garlic, mustard and black pepper in a food processor or blender. Process until well combined. Add more milk for thinner consistency. Stir in lemon juice as last step.
Toss asparagus in oil and grill over medium-high heat until slightly charred.
Serve topped with Caesar dressing, croutons and ½ cup Parmesan cheese.
