Sangrita

2 cups freshly-squeezed orange juice
3 tablespoons grenadine
1/4 teaspoon chile powder, to taste
1 cup tomato juice (optional)
3 teaspoons salt*

Mix all ingredients and serve over ice.

* If you omit the tomato juice, use 2 teaspoons of the salt.

Vampiro:
Pour 1 1/2 ounces tequila into a large glass over ice cubes, then add Sangrita. If desired, add club soda. Garnish with a lime wedge.