Jasmine flowers are small, delicate white blossoms with a very intense jasmine aroma. Because their flavor is sweet and floral, but also quite bitter, they're best used as a food-safe garnish (even though they're completely edible) than as an ingredient to be consumed.
Each jasmine blossom has five thin petals and is about 1" wide from petal tip to petal tip. They're sold with about an inch of stem attached.