Can I make this without a Ninja blender?
Yes. Any high-powered blender works. Blend in short bursts and stir in between so the ice circulates. If your blender struggles, start with 2 cups ice, blend, then add the remaining ice in batches. If your jar is small, do two batches.
How do I keep it from tasting watery?
Use enough ice for the liquid you are blending, and keep everything cold. Also, do not over-blend. Once it looks like fine snow, stop. If you want maximum flavor with minimal dilution, freeze the citrus base in ice cube trays and blend the cubes.
Can I make it dairy free?
It is naturally dairy free as written. The “luxury” here comes from texture, zest, and balance, not cream.
Can I make it boozy?
Absolutely. Start with 1 ounce per serving (2 ounces total) of vodka, gin, tequila blanco, or limoncello. Alcohol softens the freeze, so if you push it closer to 2 ounces per serving, expect a looser slush and plan to add an extra handful or two of ice.
What if it is too tart or too sweet?
Too tart: blend in 1 to 2 more tablespoons simple syrup or honey syrup. Too sweet: add 1 to 2 tablespoons lemon juice and a pinch of salt.
Why so much ice?
Because slushie texture is mostly ice. With this amount of liquid, you typically need about 3 to 4 cups ice in a high-powered blender to get that snowy, scoopable finish. Ice shape matters: crushed ice thickens faster than full-size cubes.