New England clam filling: Cook bacon in a non-stick skillet over medium heat, until crispy. Reserve bacon fat and wipe down the pan to remove any burnt scraps. Add 1 Tbsp. bacon fat back to the skillet along with the onion. Cook until the onion is translucent, about 3-4 minutes. Add the garlic and dried thyme cooking until fragrant, about 1 minute. Add the flour to the skillet, stirring for 1 minute or until lightly browned. Slowly add milk, vegetable stock, and clam juice, whisking constantly until smooth. Add the bay leaf and allow the mixture to thicken for 1 minute. Add the potatoes, reduce heat to a simmer, and cover. Stir every 2-3 minutes until potatoes are just tender, about 10 minutes. Stir in half and half, clams, and bacon. Season with salt and pepper. Allow the mixture to simmer 1-2 minutes, uncovered, until reduced to a paste. Remove from heat and allow mixture to cool to room temperature. Discard the bay leaf.