Can be made with or without alcohol, depending on the occasion and your "audience".
watermelon, cubed & frozen
ripe banana, peeled & frozen
agave nectar or maple syrup
zest from 2 limes
shots of tequila (optional)
1Blend all ingredients until smooth, adding more water as needed to keep the mixture moving.
2For margaritas: add 3-4 shots of silver tequila. Garnish with small wedge of watermelon and/or a lime wedge.