Braise the chunks of meat with the onion in a pressure cooker and then add the water. Put the lid on the pressure cooker and bring to a boil. Reduce heat to low and let cook under pressure for 30 to 45 minutes. Transfer the pressure cooker to a sink and run cold water over the lid to reduce the internal pressure. Remove the lid and add the vegetables and seasonings. Stir. Add a little water (or wine if the mood strikes) if necessary. Replace cover and bring to a boil again. Allow to cook under pressure for an additional 10 minutes. Cool lid with cold water and remove. Stir the ingredients and serve.