01 - In a medium heatproof bowl, whisk together the eggs, egg yolks, sugar, pink lemon juice, and zest until smooth and well combined.
02 - Place the bowl over a saucepan of simmering water, ensuring the bottom of the bowl does not touch the water. This gentle heat prevents curdling.
03 - Cook, whisking constantly, for 8–10 minutes until the mixture thickens considerably and coats the back of a spoon. The target temperature is 170°F.
04 - Remove from heat. Whisk in the butter one piece at a time until fully melted and emulsified, creating a silky smooth texture.
05 - If desired, stir in raspberry juice or natural pink food coloring to achieve a deeper blush hue.
06 - Pour the curd through a fine-mesh sieve into a clean bowl to remove zest and any cooked egg bits for a perfectly smooth consistency.
07 - Let cool to room temperature, then transfer to sterilized jars. Refrigerate for at least 2 hours to set completely. Keeps up to 2 weeks chilled.