3
tablespoons olive or vegetable oil
2
tablespoons grapefruit juice, from sectioned grapefruits
2
tablespoons seasoned rice vinegar
1
teaspoon Dijon mustard
1
clove garlic, finely chopped
1
head leaf lettuce, torn into bite-size pieces
1
head escarole, torn into bite-size pieces
1
small head radicchio, thinly sliced
3/4
cup sliced red onion
2
pink grapefruits, peeled, cut into sections
1/2
cup pomegranate seeds, if desired