Start by rimming the margarita glasses with coarse salt. Rub a lime wedge along the rim of each glass, then dip it into a plate of salt.
In a blender, add the tequila, triple sec, fresh lime juice, fresh orange juice, agave nectar, and a handful of ice cubes.
Blend the mixture until it's smooth and well-chilled.
Taste the margarita and adjust the sweetness or tartness by adding more agave nectar or lime juice, if needed.
Take the lime wedges and run them around the rim of the prepared glasses.
Pour the Bartaco Margarita into the glasses, and add some ice if desired.
Garnish each glass with a lime wedge.