In two batches, brown the pork cubes in 2/3 of the oil. Deglaze the pan with white wine and place the pork in the cooking pot of a slow cooker. Brown the onions over high heat in last the 1/3 oil, stirring occasionally. Add garlic in last few minutes of frying. Deglaze the pan with some of the water. Add all the ingredients, except flour and salt to the cooking pot and bring almost to a boil (180 deg F). Simmer for 4 hours. Mix flour in a little cold water and stir into stew. Simmer for another hour. Add salt and let cool. Refrigerate. Reheat and serve.