Salt the bottle

• Salt the rim of the beer bottle (Tajín works even better).

Pour out a little beer

• Dump a little of the Corona out to make room for the other ingredients.

Add the tequila and orange juice

• Pour the tequila into the bottle.
• Top with the orange juice.

Finish with grenadine

• Add the grenadine so it sinks to the bottom and creates the sunrise effect.
• Serve immediately.