Return to room temp.
Place a pot over medium-high heat and brown the chicken 15 to 20 minutes. Add the wine and reduce for a few minutes. In a small bowl, stir together the tomato paste with 1/4 cup hot water, then add to the sauce along with the stock. Bring to a boil, then reduce the heat and simmer 20 to 30 minutes more to cook through. Cool and store.
Reheat over medium heat. Serve with crusty bread.