Place juices, tequila, orange liqueur and sugar in a large pitcher. Stir until sugar is dissolved and refrigerate for at least 2 hours.
4 cups freshly squeezed blood orange juice, 1 cup freshly squeezed lime juice, 3 cups silver tequila, 1 ½ cups orange liqueur,, ¼ cup superfine sugar
Rim edges of glass with lime wedge and salt. Fill cocktail shaker and 8 low ball glasses with ice.
lime wedges, kosher salt
Pour enough margarita mix into shaker until it's ⅔ full. Shake vigorously for at least 30 seconds. Strain into ice filled glasses. Repeat with remaining margarita mix. Garnish with blood orange slices, if desired.
blood orange and lime slices
Notes
Total time includes refrigeration for making a batch of margaritas.
To make only one margarita, combine 4 ounces blood orange juice, 1 ounce lime juice, 3 ounces silver tequila, 1.5 ounces orange liqueur and 1.5 teaspoons superfine sugar in a shaker filled with ice. Shake for at least 30 seconds and strain into a salt rimmed glass filled with ice.
Can't find blood oranges? Cara Cara oranges are a reliable substitute. Not quite the same but they are the closest I've found in the citrus family.
Choose citrus fruits that are easy to squeeze. Oranges and limes that are rock hard usually do not contain as much juice and you'll need more to make your drinks.
Freeze any extra juice so you can enjoy these blood orange margaritas whenever the craving hits!