Use equal amounts of tomato and mango, shallots to taste, a squirt of lime and a dash of salt. Portions really depend on the size of the items you have on hand, the amount of dressing you like on your salad, and personal taste. (I used most of a small mango, a third to a half of a medium tomato, one shallot bulb, juice from a wedge of lime, and two grinds off my salt grinder- for two large salads.) Blend until smooth, adding water (a teaspoon at a time) to thin if necessary.