Tuna and White Bean Salad

3 Tbsp. lemon juice
1 Tbsp. extra-virgin olive oil
1 tsp. minced garlic
1 tsp. Dijon mustard
Freshly ground black pepper
1 can cannellini or other white beans, rinsed and drained
1/2 cup chopped red or Vidalia onion
1/4 cup pitted, chopped Nicoise or Greek olives
2 cups diced tomatoes
3 cups baby spinach
1 (12-oz.) can solid white tuna packed in water,
drained and broken into medium chunks

Whisk the lemon juice, oil, garlic, mustard, and several grindings of pepper, and 2 Tbsp. water in a large bowl.  Add remaining ingredients to bowl and toss to coat.  Makes four 1 3/4 cup servings servings, 260 cal., 9 gr. Fat, 5 gr. Fiber, 5 W.W. points per serving.