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- 3 eggs
- ¾ cup white sugar
- Pinch of salt
- In a saucepan, whisk eggs, sugar, salt, juice, and all citrus zest together.
- Cook over low heat, stirring constantly. Mixture will start to thicken after 4–5 minutes. Keep stirring until very thick.
- Remove from heat and stir in the butter.
- Place in airtight container, and keep in fridge until ready to use.