Avocado and Mango Salad

Combine vinegar, oil, sugar, mustard, and pepper in a bowl. Refrigerate dressing until ready to serve.

Place avocados, mangoes, and lemon juice in a bowl. Mix gently until just combined.

Place lettuce in a large bowl or platter. Add avocado-mango mixture, walnuts, bacon, and the dressing. Toss and serve.