This is a classic winter salad that invites a lot of variations. The tartness of the citrus is mellowed and complimented by the richness of the avocado. I am transcribing a very simple version here with almost no adornment because I think it's always best to start off with something simple and then embellish from there.
I don't buy a lot of imported produce because I believe it's important to eat mostly locally grown food but I allow myself a few indulgences and one of the regular indulgences I allow are avocados. Because I let myself buy quite a lot of avocados I don't let myself buy citrus very often. A family friend sent me two boxes full of oranges, lemons, and grapefruits from her own yard that she grew without pesticides- it was a gift beyond price! I haven't had a grapefruit avocado salad in years and it is the perfect antidote to the usual deep winter root vegetable flavors and the grey skies.
4 cups lettuce
1 large avocado
4 tbsp mustard vinaigrette
(Serves 4 as a side salad or 2 as a main salad)
Method: Divide lettuce onto your plates evenly. Slice the grapefruit in half and then (using a small sharp knife) cut out the sections and divide the slices evenly between the plates. Slice your avocado in half, remove the pit, and then slice long narrow slices lengthwise. If serving only two plates of salad remove all the long slices from one half and arrange on one plate (fanning them out is pretty) and then do the same with the other half. If making four side salads then I cut the long slices in half and divvy the avocado up between the four plates and arrange neatly. Drizzle 1 tbsp of dressing on each side salad or 2 tbsp on each main salad.
Variations: Kalamata olives are very good with citrus and avocado. Feta is wonderful on this salad. Instead of a mustard vinaigrette you could use a balsamic or a dressing flavored with rosemary. Slice red onions paper-thin and add to each plate sparingly. The same can be done with shallots. If you don't have grapefruit but you have very good oranges on hand- use them! Oranges go very well with the avocado too.