I can't tell you how many times I've made mushy, soupy rice. There's a quick fix that transforms this gluey mess into perfect, fluffy rice: a slice of bread. Place a piece of bread on top of your pot or rice cooker full of mushy rice, put the lid back on, and allow to sit for 5 to 10 minutes. The extra liquids will make their way into the bread, and your rice is saved. I use the ends of my bread loaves for this as no one in my family ever touches those.
