Start by heating 2 tblsps olive oil in a large saucepan over medium heat. Add one head’s worth of peeled, cracked garlic and any sliced leeks, shallots, or onion and cook, tossing around occasionally, until they are golden brown all over, 8-10 minutes. Toss in some red pepper flakes, or fresh chilies if you have them. Add two quarts of water and bring to a simmer. While the water is heating, grab a handful of fresh herbs like thyme, sage, cilantro, or scallions. Add them to the pot, along with one more head of garlic, halved crosswise. Gently boil until broth is reduced by a about a quarter and garlic cloves are super soft, 30-40 minutes. Season with salt and pepper to taste. Strain the broth. You can add fresh noodles to it, float a toast on top, drizzle in some whisked eggs to make a stracciatella, or just sip as is.