Starving-Student Apple Salad with Feta Cheese

1 large apple, your favorite type
1/4 cup of raspberry vinaigrette
1 large head of bibb lettuce, torn into bite-sized pieces
2 ounces of Feta cheese, crumbled

Dice the apple right before serving and toss with the vinaigrette.

Combine with the lettuce and the cheese.

Serve.