Slice the grapefruits in half and using a small knife, cut to loosen the grapefruit segments (and carefully cut around the grapefruit to loosen from the peel, making it easier to eat). Place each half upright on a baking sheet and add ¼ teaspoon of rose water to each grapefruit half, letting it soak in.
In a small bowl, stir together the melted butter and brown sugar. Divide evenly among the tops of the grapefruit halves.
Place the baking sheet with the grapefruits in the oven, about 4 inches from the heat source. Broil for about 3-4 minutes, until the sugar is bubbly and the top begins to brown.
Transfer each half to a plate (or on a tray, if serving). Top with ricotta and crushed pistachios, if desired.
Recipe by thyme & toast at https://thymeandtoast.com/rose-water-broiled-grapefruit/