Soak 2 cups of rice in water for 1/2 hour. While rice is soaking, saute onions and oil in large pot; turn up heat to brown. Reduce heat to medium, and add frozen vegetables to pot. Add 4 cups water to pot, along with salt, curry powder, ginger, and red pepper. Stir in lemon juice. Increase heat to high and add (drained) rice to pot. Heat rice to boiling; boil for 1 minute; reduce heat to low and simmer until all water is gone.