01 - In a medium heatproof bowl, whisk together the eggs, egg yolks, sugar, pink lemon juice, and zest until completely smooth and well combined.
02 - Place the bowl over a saucepan of simmering water, ensuring the bowl bottom does not touch the water surface to create proper double boiler conditions.
03 - Cook while whisking constantly for 8-10 minutes until the mixture thickens noticeably and coats the back of a spoon, reaching approximately 170°F.
04 - Remove from heat immediately. Whisk in the butter pieces one at a time, allowing each piece to fully melt before adding the next, until the curd achieves a silky smooth consistency.
05 - If a deeper pink hue is desired, stir in raspberry juice or natural pink food coloring until the preferred color intensity is achieved.
06 - Pour the curd through a fine-mesh sieve into a clean bowl to remove the zest and any cooked egg bits, ensuring a perfectly smooth texture.
07 - Allow the curd to cool to room temperature, then transfer to sterilized jars. Refrigerate for at least 2 hours to set completely. Properly stored, the curd will keep for up to 2 weeks.