Garlicky Pot Roast

Ingredients

• 8 heads of garlic
• 1/4 cup olive oil
• 3 tablespoons chopped garlic (about 4 large cloves)
• 1/4 cup light brown sugar
• 1/4 cup olive oil, plus extra for browning the roast
• 1/2 cup balsamic vinegar
• 2 tablespoons tomato paste
• kosher salt and freshly ground black pepper
• one 3- to 5-pound chuck roast, fat trimmed
• olive oil
• 2 large spanish onions, chopped
• 6 garlic cloves, chopped
• 1 cup dark beer such as guinness or aventinus
• 1 whole head of roasted garlic
• 2 cups chicken stock
• 1 cup crumbled gingersnaps (about 15 small cookies; store-bought are fine)
• 1/4 cup tomato paste