Avocado and Pinneapple Salad

1/4 cup olive oil
1/4 cup cider vinegar
1/4 cup fresh orange juice
1/4 cup sugar
4 cups Iceberg or Boston lettuce shredded
1 cup fresh pineapples 1/2 inch cubes
1 cup sweet onions thinly sliced
1 Avocado peeled, sliced, 1/4 inch thick
4 fresh lime wedges

1.Combine olive oil, vinegar, orange juice and sugar in a blender until smooth.  Season with salt and pepper
2. Lightly toss together the lettuce, pineapple and red onions. Dress with the oil and vinegar mixture adjust the amount to taste
3. Garnish individual salads with several avocado slices lightly seasoned with salt and pepper and squeeze of lime juice.  Serve with lime wedges