Rince the rice well with several washings of cold water. Heat the lard or bacon drippings in a large heavy skillet. Add the rice and stir until it becomes brown. Add the onion and cook until it is golden. Add the tomatoes, boiling stock, salt, and chile. Add chile 1 Tbsp at a time, tasting after each addition. Add more salt if you prefer the rice saltier. Steam until rice is fluffy, about 15 minutes. After 15 minutes, check doneness and cook a bit more if needed.