Kosher salt or coarsely ground sea salt
2 ounces (¼ cup) silver tequila
1 ½ ounces (3 tablespoons/about 1 ½ small limes) fresh lime juice
1 ounce (2 tablespoons/about ½ of a medium orange) fresh orange juice
1 teaspoon light agave nectar
1 lime wedge or round, for garnish