Tuna steaks poached until rare in a bright, buttery sauce that's infused with tangy lime and kumquats, spicy jalapeños and fresh mint. Doubled or tripled, it would make an excellent dinner-party dish.

Ingredients

• Two 6-ounce tuna steaks, cut 1 1/4 inches thick
• Kosher salt
• 4 tablespoons unsalted butter
• 1/4 cup extra-virgin olive oil
• 2 tablespoons fresh lime juice
• 1 small jalapeño—stemmed, seeded and minced
• 4 kumquats, thinly sliced
• 1/4 cup mint leaves, torn

Directions

• Season the tuna steaks with salt. In a medium saucepan, melt the butter in the olive oil and lime juice. Stir in the minced jalapeño and sliced kumquats. Add the tuna steaks and cook them over moderate heat, turning once, until they're rare, about 4 minutes.
• Transfer the tuna steaks to a carving board and slice them 1/3 inch thick, then arrange them on plates. Stir the torn mint into the sauce, spoon over the tuna and serve.