Step 1

Cook the quinoa according to the package instructions.

Step 2

In a small bowl, whisk together the chili sauce, soy sauce, lime juice, and olive oil. Put the tuna steaks in a large zip-top bag, pour in the chili sauce mixture, and marinate for at least 10 minutes or in the refrigerator for up to 2 hours.

Step 3

In a skillet on the stovetop, melt the butter over medium heat. Discard the marinade and add the marinated tuna steaks to the skillet and cook for 3 to 4 minutes, until a slight crust forms on the bottom. Flip and cook for 3 to 4 minutes on the second side.

Step 4

Divide the tuna among four plates and spoon the quinoa alongside. Garnish with the cilantro and sesame seeds and serve, with lime wedges alongside for squeezing over the top.