For the Tart Crust:
1¼ cups All-purpose flour
½ cupCold unsalted butter (cubed)
2 tablespoonsGranulated sugar
¼ teaspoonSalt
1Egg yolk
1–2 tablespoonsIce water
For the Miso Caramel Filling:
1 cupGranulated sugar
3 tablespoonsWater
½ cupHeavy cream (warm)
4 tablespoons Unsalted butter
1½ tablespoonsWhite miso paste
½ tablespoonsVanilla extract
For the Caramel Popcorn Topping:
3 cupsFreshly popped plain popcorn
½ cup Granulated sugar
2 tablespoonsUnsalted butter
¼ teaspoonBaking soda
a small pinchSalt