In a large saucepan, warm the butter and olive oil over medium heat. Add the pancetta and cook until golden, 7 to 9 minutes. Add the garlic, onions, carrot, celery, bay leaf, coriander and cloves and cook over low heat until the vegetables are soft, 12 to 15 minutes. Add the chicken and cook stirring occasionally until lightly colored, 5 to 7 minutes. Add the wine and simmer 3 minutes. Stir in the tomato paste and cook, 2 to 3 minutes. Add the tomatoes, salt and pepper and cook, partially covered until the sauce thickens, about 1 hour. If it gets dry, add water.
Season to taste. Remove bay leaf.
To serve, place the hot loose polenta on a large shallow serving dish. Make a well in the center and spoon the chicken and tomatoes into the center. Serve immediately.
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