Bring 3 1/2 cups of water to a boil in large saucepan. Add rice and reduce heat to medium. Cook until just tender about 35 to 40 minutes. Fluff with a fork when ready.
In a large skillet over medium heat, melt butter. Add onions, celery, carrots, peppers, salt and pepper. Saute until softened, about 5 minutes.
In a separate pan over medium-low heat, toast almonds. Stir occasionally until browned.
Add peas and red pepper flakes to the vegetables. Add rice to skillet. Mix together and allow to cook for a few minutes. Remove from pan. Add almonds and top with parsley.