Arroz Verde (Green Rice)

I've been asked for this recipe A LOT. It's from "The 150 Best American Recipes" a book I would reccomend to anyone, every recipe is worth it, and I wouldn't say that lightly about a cookbook.

Arroz Verde
1 cup tightly Packed stemmed spinach leaves (a big wad)
1/2 cup tightly packed cilantro springs (i do half a bunch)
1 1/4 cups milk
1 1/4 cups broth
1tsp salt
1 1/2 cups long grain white rice
1/4 cup minced onion ( I do up to one onion)

Place the spinach, cilantro, and broth in a blender and blend until pureed. Add teh milk and salt adn blend till well combined.
In a medium saucepan, heat the butter and olive oil over medium heat. When the butter is melted, add the rice and saute, stirring frequently, until it just begins to brown, 3 to 4 minutes. Add teh onion and garlic and cook for 1 min mroe, stirring constantly. Add teh spinach mixture, stir well, increase the heat to low, and cook for 20 min (DON"T STIR). AFTER the 20 min, stir the rice carefully to avoid crushing it, cover and cook 5 min more. Remove from heat, let the rice steam in the covered pot 10 more min, or just start eating it for goodness sakes!