Source: Mango Banana Daiquiris, Barefoot Contessa Back to Basics
2 cups chopped ripe mango (1 to 2 mangos, peeled and seeded)
1 ripe banana, chopped
½ cup freshly squeezed lime juice (4 limes)
¼ cup sugar syrup (see note)
1 ¼ cups dark rum, such as Mount Gay
Mango slices, for serving
Note: To make sugar syrup, heat 1 cup sugar and 1 cup water in a small saucepan until the sugar dissolves. Chill.
Place the mango, banana, lime juice, sugar syrup, and rum in a blender and process until smooth. Add 2 cups of ice and process again until smooth and thick. Serve ice-cold in highball glasses with mango slices.