The great thing is that it’s really, really easy.
Set the oven to 400 degrees fahrenheit.
Gather up the ingredients: 2 pounds of tomatillos, 5-6 cloves of garlic, an onion, 1-2 jalepenos, cilantro, lime, and olive oil. Salt and pepper too, I forgot to include ‘em in the picture.
Next, skin and wash the tomatillos (they come with a papery exterior that peels off), and chop them and the onions into relatively the same size. Separate the garlic cloves. I keep them in a couple layers of their papery skin—we’ll push ‘em out after they're roasted. Spread them out into a single layer in 1-2 pans. Drizzle with 2-3 T of olive oil, sprinkle with salt and pepper, and put the pans in the oven.
Roast until browned and the tomatillos are collapsing onto themselves.
Separate the roasted garlic from its papery shell, add some roughly chopped cilantro, and puree the whole thing with a stick blender, or in a regular blender.
Add chopped cilantro and several squeezes of lime juice. Delicious!