Combine tequila, blood orange juice, lime juice, triple sec, and agave in shaker
Add ice from serving glass to shaker
If you are going to salt the rim of the glass now is the time. Spread kosher salt on small plate. Run lime wedge along rim of glass. Dip rim into kosher salt to coat.
Shaker for 5-10 seconds or until shaker cold this very cold to touch
Strain into serving glass with fresh ice
Optional, garnish with blood orange wedge and/or lime wedge
Notes
I prefer my drinks stronger and more acidic. Additionally, blood oranges can be very bitter at times so add more agave syrup to suit your taste.