Asparagus, Tuna & white Bean Salad with tomatoes & Feta Cheese

 2 Bunches of fresh asparagus
1/2 chopped sweet onion
1 container cherry tomatoes halved
1 large can northern white beans
10 ounces albacore tuna
olive oil vinagrette dressing use your favorite & as much as you like
Feta Cheese to sprinkle on each serving
   Cut asparagus into bite sized pieces. Blanche asparagus till crisp but tender about 3 minutes. Drain & cool. Add asparagus & remaining ingredients except cheese. Stir & chill. Top each serving with Feta cheese & serve!