Total time: 20 min • Prep: 10 min • Cook: 10 min • Serves: 4 • Difficulty: Easy

This all-purpose sauce is loaded with allium flavor from sweet onions and garlic and lifted with the brightness of lemon juice and zest. The creaminess comes from blending the onion and garlic once they’re slow-cooked until buttery soft. The sauce is great for draping over everything from steamed or roasted vegetables to seared scallops, sautéed chicken breasts, or roasted salmon fillets. It’s equally good served warm or at room temperature. Store leftovers in the refrigerator for up to three days, and whisk after reheating if the sauce separates.