Bring a saucepan with a few inches of water to a gentle simmer.
In a heatproof bowl, whisk together the egg yolks, powdered allulose, lemon zest, lemon juice, lemon stevia, and wine (or water).
Place the bowl over the simmering water (the bowl should not touch the water).
Whisk constantly for 6–8 minutes, until the mixture is pale, glossy, and thick enough to coat the back of a spoon.
Remove from heat immediately. Pour into 3 serving glasses. Serve warm or chilled.
Top with fresh berries and extra lemon zest. Can be refrigerated in an airtight container for up to 24 hours. Texture will thicken slightly as it chills.