Tangy fermented pepper paste, the base of Burns’ harissa, can be customized to be as sweet or spicy as you prefer. “Mine is usually in the middle,” she says. The sauce can be used immediately, but Burns says the leftovers will continue to improve in taste for up to 6 months and keep indefinitely in the refrigerator. Slow-cooking the short ribs at the oven’s lowest temperature, or in a low-heat dehydrator, ensures that the centers stay medium-rare. And a quick sear on a grill or grill pan delivers crispy edges.