3 1/2 teaspoons white grape juice and 2 1/2 teaspoons apple cider vinegar
2 tablespoons fresh lemon juice
2 tablespoons minced shallot
3/4 cup walnut oil
1/4 cup olive oil
8 large butter lettuce leaves
3 ripe avocados, halved, pitted, peeled, thinly sliced, rinsed under cold water
3 large Ruby Red grapefruits, all peel and white pith cut away, segments cut from between membranes
Whisk first 3 ingredients in small bowl to blend. Gradually whisk in both oils. Season dressing to taste with sea salt and pepper.
Arrange lettuce on platter. Top with avocado and grapefruit, then dressing.