heat the oil in a pressure cooker over medium-high heat. Add the meat; cook, turning occasionally, until the outside is browned. Pour in the water, vinegar and stock cube. Add the bay leaves and season with salt and pepper to taste.
Close the lid on the pressure cooker and bring to full pressure. Adjust the heat as needed. Once the pot comes to full pressure, cook for 15 minutes. Remove from the heat and release the pressure according to the manufacturer's instructions.
While the pressure is releasing, mix together the flour and 1/2 cup of water in a cup. Pour this into the pressure cooker, and cook over medium-high heat, stirring frequently, until thickened.
You can also cook this in a pot; simmering it for about 1 1/2 hours, or until the meat can be easily cut with a fork.