Meanwhile, make grapefruit supremes: Trim off all peel and pith from grapefruit. Halve grapefruit. Working over a bowl, make smooth cuts between membranes to separate fruit segments, dropping them ...

A layer of grapefruit slices and a grapefruity drizzle makes this zingy upside-down cake a wake-up call for the tastebuds. It's easy to whip up for an afternoon tea treat with a difference.