A no-bake creamsicle dessert with reduced-orange-juice-soaked wafers and a tangy zested cream, sliced into cool, dense layers.
Reduce the orange juice a day ahead if you want to shorten hands-on time — it keeps refrigerated for a week. Don"t skip the sour cream; without it the cake tastes flat and overly sweet. For a firmer slice, add an extra hour of chill time before cutting. Leftovers keep well covered in the fridge for up to 4 days.