Harissa Mayonnaise with Olives and Lemon

This punchy, subtly spicy sauce combines North African flavors. Briny green olives and lemon add texture and bright contrast to spicy harissa. Use it as a spread in sandwiches, as an embellishment for a frittata, as a flourish for roasted vegetables or as a dipping sauce (think whole roasted artichokes). For a tangier sauce with a more cooling quality, use whole-milk Greek yogurt in place of the mayonnaise.