Fill the shaker half way with ice. Squeeze in the juice from the lime and orange, toss in the squeezed lime half.
Measure in Solerno, tequila and Bruto Americano.
Using the blood orange rind, rub the rim of the glass half way around. Press the glass rim into the salt until the half rim is coated. Shake the shaker with the top on until it’s icy cold. Pour into festive salt-coated glasses and serve.