Ingredients
1/4 cup
low-fat plain yogurt
1 tbsp fresh
lemon juice
1/2 tsp
coarse salt
1/4 tsp
ground pepper
1
apple (about 2 cups), cored and cut into 1/2" pieces
1 stalk
celery (about 1/2 cup), thinly sliced crosswise
1/2 cup
red seedless grapes, halved
4 leaves
Boston lettuce
1/2 cup
walnuts, chopped and toasted