Spread a layer of salt in a shallow dish. Run the lime wedge around the rims of 4 highball glasses or 2 goblets to moisten; dip ribs in salt.
Place orange juice, tequila, orange liqueur, and lime juice in a blender. Add ice and pulse until smooth. Divide drinks evenly among glasses.
Tilt glasses and drizzle 1 to 2 tablespoons grenadine down the side of each drink; grenadine will sink to the bottom and create a sunset effect. Garnish with orange slices and maraschino cherries and serve.
The original recipe calls for 6 ounces of tequila, but I actually only added 3 ounces. If you don’t have any kids and want to stay in bed all day then add the extra tequila.