1 head lettuce, pat it dry, and rip it up into bite-size pieces. Divide it onto two plates.
Peel 1 grapefruit, and pull apart sections. (Feel free to remove the membranes; I don’t because they don’t bother me and, midweek, I don’t have the time—nor the patience—to do it.) I use about four grapefruit sections per salad, but go wild and use five if you want to. Cut the sections in half and sprinkle them over your lettuce.
Slice 1 avocado into eighths and remove peel. If it’s going to sit for awhile before you eat it, toss it with a little lemon juice mixed with water, or an anti-browning product like Fruit-Fresh. Put four avocado slices on each salad.
Drizzle salads with 2 Tbsp French dressing to taste and serve.