You can replace the water with grapefruit juice for a more pronounced grapefruit taste and to accentuate the tartness in the filling. If you’d like a deeper red filling, you can also replace some of the water with blood oranges.
You can also spread the meringue in an even layer over the grapefruit cream using a spatula.
You can brown the meringue in the oven under the broiler for a few seconds.
