Chill your glass: Place a rocks glass in the freezer for a few minutes, or fill it with ice and water while you build the drink.
Prep the garnish: Cut a thin wheel of blood orange or peel a wide strip of zest. Express the oils by gently bending the peel over the glass later.
Build the drink: In a mixing glass, add gin, Campari, sweet vermouth, and fresh blood orange juice.
If you like a brighter profile, use the full 1.5 ounces of juice.
Add ice and stir: Fill the mixing glass with ice. Stir for 20–25 seconds until well-chilled and slightly diluted. You want the edges to soften without losing structure.
Prepare the serving glass: Discard any ice water from your rocks glass.
Add a large clear cube if you have one—it melts slowly and keeps the drink crisp.
Strain and garnish: Strain the cocktail into the glass. Express the blood orange peel over the drink, rub it along the rim, and drop it in. Or tuck a thin blood orange wheel against the cube for a clean look.
Taste and adjust: If you crave extra citrus, add a small splash more juice and give it a gentle stir.