It's made by consistently heating whole heads of garlic over the course of several weeks, which results in something similar to roasted garlic, but even more earthy and caramelized in taste. (golubkakitchen.com)
You could even increase it to 2 whole heads if you're a big garlic fan. (lanascooking.com)
Throw in a few whole heads of garlic... and I am in. (floandgrace.com)