Place the heavy cream, butter, and blood orange zest in a small saucepan over medium-low heat. Warm gently for about 5 minutes, stirring occasionally. Do not allow it to boil.
Remove from heat, cover, and let steep for 10 minutes to infuse the citrus flavor.
Place the white chocolate chips in a large heatproof bowl.
Reheat the cream mixture just until hot (not boiling), then strain it over the white chocolate.
Let sit undisturbed for 2 minutes. Stir gently from the center outward until smooth and fully melted.
Stir in the tequila, blood orange juice, lime zest, and salt (if using). Mix until fully incorporated. Add 1–2 small drops of orange gel or oil-based food coloring and stir until evenly colored.
Cover and refrigerate for 4–6 hours, or until firm enough to scoop.
Line a baking sheet with parchment paper and pour granulated sugar into a shallow dish.
Use a small cookie scoop to portion the mixture and roll into 1½-inch balls. Work quickly, as white chocolate softens easily in warm hands.
Roll each truffle in sugar and place on the prepared baking sheet.
Refrigerate for 30–60 minutes before serving to firm completely. Enjoy