Make sure your amaranth grains are clean and free of debris. Most amaranth purchased is already cleaned, but you want to make sure.
Bring the water to a boil in a medium pot. Add salt.
Add the amaranth grains to the boiling water.
Reduce the heat to low, and simmer for about 20 minutes, or until the grains are tender and the water has been absorbed.
The amaranth is now fully cooked. Spoon it out of the pot onto a plate. We'll add it back in soon.
Add olive oil to the pot. Heat for a few minutes on medium to high heat.
Add onions, green peppers, and garlic. Sauté for 5-8 minutes until tender.
Add cooked amaranth, petite diced tomatoes (drained), sautéed onion/pepper/garlic mixture, and spices.
Stir to combine.
Add cooked whole grain brown rice (I cook mine in a rice cooker with equal parts of dry rice to water).
Mix to combine. Add any pepper or additional salt to taste. Serve immediately. Top with cilantro and jalapeño, if desired.