Red and spring onions, garlic and fermented black garlic, fresh thyme, tomato paste, sherry, beef bone broth, chicken bone broth, sea salt, pepper and allspice.
Melt butter in a Dutch oven over medium-low heat and cook chopped garlic and slivered onions, stirring occasionally, until the onions are caramelized and the garlic has melted, about 1 hour.
Deglaze the pan with sherry, scraping up all the brown bits with the side of a wooden spoon.
Add tomato paste, beef and chicken stock and simmer 20 minutes.
Add thyme and S&P to taste and ladle into bowls set on a baking pan.
Top with a large croûton fried in butter and chopped parsley.
Bake at 500 degrees (or broil briefly) until the cheese is bubbly.