Peel garlic cloves from 1–2 whole heads. Set aside.
Melt beef tallow in a small skillet over medium-low heat. Use enough to fully cover the garlic.
Add garlic cloves to the skillet. Add fresh thyme, bay leaf, or peppercorns if desired.
Simmer gently for about 1 hour, stirring occasionally, until garlic is golden and soft. Avoid browning.
Remove from heat and allow to cool slightly.