In a large microwaveable bowl, (2 1/8 cups) combine rhubarb, brown sugar and ginger. Microwave on high for 5-7 minutes. (700-watt oven) or until rhubarb is tender, stirring occasionally. Add squeeze of lemon juice. Stir and let cool until warm.
To serve, place scoop of frozen yogurt on angel food cup or wedge. Spoon warm rhubarb sauce all over.
TIP: Sauce can be made ahead of time, and reheated just before serving. If using field rhubarb, taste, and add more sugar if needed.
Angel food cups are called a variety of names such as berry cups.