Pistachio-Caper Vinaigrette Recipe A fresh take on dressing like this one? W/ toasty flavors from pistachio oil, fragrant lemon, & briney capers, it’s as complex in taste as it’s simple to make. Use it on the addictive Fennel, Avocado, & Mint Salad. What to buy: Pistachio oil, w/ its nutty, multidimensional flavor, makes a sophisticated addition to this dressing. You can find it at some health food stores or online. Pumpkin seed oil is a decent substitute.