COMBINE spinach, radicchio, cucumbers, beans, tomatoes, pine nuts and chickpeas in large bowl.
FOR each serving: Brush 1 tuna steak with 1-1/2 tsp. oil; season with salt and pepper. Grill to medium, or desired doneness; cool 5 min. Brush with 1/2 tsp. dressing.
TOSS about 2 cups spinach mixture with 2 Tbsp. of the remaining dressing; place on plate. Top with 1/4 cup Israeli Couscous Salad, 1 tuna steak and 1 tsp. Parmesan cheese.