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.

You can make your own candied lemon, if you have the time. Use a zester to peel long strips of lemon zest and place in a saucepan with a thin, even covering of sugar and a little water. Boil for ...