Fill a highball glass with ice. Pour in two oz of tequila (a silver is prettiest, in my opinion!) and fill almost to the top with fresh squeezed sour orange juice. Carefully pour 1/2 oz of grenadine (homemade preferred!) in a circle on top. Garnish with a cherry and orange slice, if desired.
This is a fabulous way to use up left over sour orange juice from making homemade orange liqueur!