Pour the oil into the Cooking Pot. Press BROWN/SAUTE, set temp to HIGH and then press START/STOP. Once preheated, place the pork into the cooking potand brown all sides. Press START/STOP. Add the leek to the cooking pot and continue to brown for 2 minutes. Add the tomatoes, water and cider to the pork. Secure the lid. Press MEAT/STEW, set pressure to HIGH, and adjust time to 2 hours. Make sure the steam release valve is in the ‘seal’ (closed) position. Press START/STOP.