While the corn is grilling make the lime butter: In a small bowl add the butter, lime zest, chervil, and salt and pepper, to taste. Mix well and spread onto a large plate. Spread the queso fresco onto another plate.
Take the corn off the grill and carefully peel back the husks (it will be hot). Remove the corn silk and tie the husks in a knot so you can hold on to it like a handle. Roll in the lime butter and then roll in the queso fresco; sprinkle with the Ancho Chile Rub. Place on a large platter and serve immediately.