Grapefruit Margarita

Bahan-bahan (1 porsi)

• 2 ounces freshly-squeezed grapefruit juice
• 1 1/2 ounces tequila, silver or reposado
• 3/4 ounce Cointreau (or any orange liqueur)
• 3/4 ounce freshly-squeezed lime juice
• agave nectar for sweetening, to taste
• ice
• optional: lime wedge and salt for rimming the glass