Add the brown rice to a pot together with the bay leaf, a good pinch of sea salt and the water. Bring it to a gentle simmer, cover with a tight lid and cook for 13 minutes, or according to the directions on the package.
Remove the rice from heat and allow it to sit covered for 10 minutes.
Meanwhile peel and cut the mango.
Add the to the bowl of a food processor together with the cilantro, scallions, poblano chile and olive oil. Puree until smooth.
Transfer the cilantro mango sauce to a large bowl and mix in the lime juice. Season to your taste with sea salt.
Add the cooked brown rice to the pot with the cilantro mango sauce and using a spatula toss to coat all over.
Adjust seasonings and serve the Arroz Verde or green rice garnished with the reserved cilantro leaves and red chile pepper.