Grilled Tuna with Sun-Dried Pepper & Sesame Sauce

Eating the delectably smoky grilled fish sold along roadsides and beaches in Nayarit, on Mexico's west coast, is an experience that's impossible to forget. This fish is basted with a local sauce-a sesame-infused red pepper concoction-and every bite calls for another. This recipe features grilled tuna, which is wonderful accompanied by mashed potatoes seasoned with sour cream, lime juice and green onions.