Avocado is is one of the healthiest fruits on the planet. An average California variety has 289 calories and 24 grams of fat, but most of it is monounsaturated, which lowers "bad" LDL cholesterol and raises "good" HDL levels. The fat in avocados may also aid your body's ability to absorb cancer-fighting lycopene and beta-carotene.
Bright onions, sweet avocado, and salty capers come together in this quick tartine. To mix it up, top your toast with smoked trout or soft-cooked egg, as well.
Avocado makes this soup pleasingly creamy. Serve it straight from the blender, when it is still frothy, or well chilled during warmer months. Use sorrel as a garnish; its bright, lemony flavor is a wonderful accent. If you are unable to find pencil-thin asparagus, you can trim thicker stalks with a vegetable peeler or paring knife.