Add chicken stock to the pot. Bring to a boil and then reduce to a simmer on medium heat, with the lid off of the pot. When the liquid has evaporated by 90%, turn off the heat and cover with the lid and let the rice absorb the flavors.
Allow cooked rice to sit for 10 minutes before uncovering and stirring.
Add butter, lime juice, cilantro, lime zest and gently toss with fork. Add salt to taste.