Avocado and Citrus Salad

For four to six
Juice of 1 lemon
4 tablespoons of olive oil
Salt and pepper
2 ripe but firm avocado pears
1 orange
1 grapefruit
Mint leaves for garnish

Prepare avocados - one may be OK & useful to use ones that are not so soft. Peel orange and grapefruits and remove the pith from each segment (grapefruit - can cut in half and then cut out segments - may be more difficult with orange - ruby looks good). Prepare the vinagrette.