Preheat your oven to 425 F.
Place the ham slices on a baking sheet and bake for about 15 minutes, flipping once. Set aside.
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lb of your favorite good quality ham
In a large casserole, melt the cooking fat on a medium flame on the stove-top. Add the onions and lower the flame to low. Cook, covered, for 15 minutes stirring occasionally.
3 tablespoon cooking fat, 2 large onions
Add the bay leaves, a few pinches of herbes de Provence and season to taste.
2 bay leaves, Herbes de Provence, Sea salt and freshly ground black pepper
Cover again and cook for another 15 minutes, still stirring from time to time, until the onions are colored and caramelized.
Pour in the beef stock, bring to a simmer and season with salt and pepper again.
4 cups homemade dark beef stock, Sea salt and freshly ground black pepper
At this point, the soup is ready to be served in individual boils with a slice or two of ham on top of each bowls.