Thoroughly rinse the rice in a mesh colander. Shake it a few times to remove excess water, or blot it dry with paper towels.
Pulse the cilantro, spinach, shallot, serrano, and garlic in a food processor until very finely chopped.
Add olive oil to a skillet over medium high heat. Add rice and sauté for 3-5 minutes until lightly toasted. Add the herb mixture and salt; sauté for another 3-5 minutes until nice and fragrant.
Add the broth or water, bring to a simmer. Cover and keep over low heat for 15-ish minutes. Check the rice by fluffing with a fork; add more water / cook longer if necessary. When the rice is done to your liking, remove from heat and fluff with a fork to distribute the greens.
