I suggest making a single serving first and taste it so you can add more/less tequila or syrup to your liking. Everyone is different and prefers their drinks a different way, so feel free to add more or less tequila, more simple syrup, more lime juice, etc. This is my absolute favorite combo listed above.
Before serving, rim the edge of the glass with a lime slice and then dip it in coarse salt + cayenne to coat. Fill the glass with just a few ice cubes or even with crushed ice – my ice preference of late.
In a shaker, combine the orange juice, tequila, lime juice, grand marnier and simple syrup. You can add a pinch of cayenne here if you want! Shake well for 30 seconds, then pour it over the crushed ice, leaving about an inch of room up top.. Take your beer bottle and quickly pop it into the drink. Garnish with the extra limes and blood orange.