01 -
Adjust oven rack to middle position and preheat oven to 190°C (375°F).
02 -
Spread lemon curd evenly into par-baked and cooled tart crust. Place tart pan on baking sheet and bake until filling appears shiny and opaque with slight jiggle in center when shaken, about 8-10 minutes. Rotate pan halfway through baking time.
03 -
Transfer tart with baking sheet to wire rack and allow to cool for 10 minutes.
04 -
If using freeze-dried berry powder, fold it gently into the rhubarb curd until fully incorporated.
05 -
Carefully spoon rhubarb curd over the lemon layer. Using an offset spatula, gently spread into an even layer with a smooth surface. Return to oven and bake until set with slight jiggle in center, about 15-18 minutes.
06 -
Allow tart to cool completely at room temperature for at least 1 hour before serving.