Edible flowers make this salad as beautiful as it is delicious, though they are a finishing touch that can be skipped when not available.  Fortunately, we are so early in the growing season that you can plant seeds now and pick flowers from the garden rather soon.  In the meantime, farmers markets and shops often sell edible pansies, violas, and other varieties, and these tips will help make sure you’re enjoying them safely. With or without colorful petals, the recipe below yields a light and fresh salad tossed with a tasty vinaigrette that’s perfect for enjoying under sunny skies.  The peppery flavor of arugula pairs well with sweet strawberries and…