Photo from Martha Stewart/Yummly  Ingredients: 3 cups short-grain brown rice 1/2 cup finely chopped scallions (about 6), white and pale-green parts only 3 ounces baby spinach (about 4 1/2 cups) 8 ounces sliced mushrooms 15-16 ounces extra-firm tofu, drained and cut into cubes Sprinkle of dried ginger 4-6 garlic cloves, minced 1/4 teaspoon salt 1/4…