1. **Make the Syrup:**
In a small saucepan, combine the sugar and water. Heat over medium heat, stirring until the sugar dissolves completely to create a simple syrup. Remove from heat and let cool.
2. **Juice the Grapefruits:**
Squeeze the juice from the grapefruits and strain to remove any pulp or seeds. Measure out 2 cups of juice.
3. **Combine Ingredients:**
In a mixing bowl, whisk together the grapefruit juice, lemon juice, simple syrup, and grapefruit zest (if using). Taste the mixture and adjust sweetness if needed by adding more sugar or syrup.
4. **Chill the Mixture:**
Cover and refrigerate the mixture for at least 2 hours, or until thoroughly chilled.
5. **Churn the Sorbet:**
Pour the chilled mixture into an ice cream maker and churn according to the manufacturer’s instructions, usually about 20-25 minutes, until it reaches a sorbet consistency.
6. **Freeze to Firm:**
Transfer the churned sorbet to an airtight container and freeze for at least 2 hours to firm up before serving.
7. **Serve:**
Scoop the sorbet into bowls or cones and enjoy this light, citrusy dessert!
**Prep Time:** 15 minutes | **Chilling and Freezing Time:** 4-6 hours | **Total Time:** 4-6 hours 15 minutes
**Kcal:** 120 kcal | **Servings:** 4 servings
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