One of the easiest ways to add flavor to your salads is to swap out the mild greens like spinach and romaine for bold, bitter ones. These types of greens add a ton of flavor that pair perfectly with bright, punchy vinaigrettes. Our mix uses a combination of Belgian endives and radicchio to add a pleasant bitterness and pop of color. These two greens are the most common bitter greens available in grocery stores, but if you can’t find them you can substitute any other bitter salad green. Mizuna and watercress would both work well.