Place leek, garlic, thyme, celery, capsicum, salt and butter into the Thermomix bowl and chop 3 sec/speed 5. Saute 5 min/Varoma/speed 1.
Add pumpkin, stock and Umami Paste, and cook 14 min/100°C/Reverse/speed 1.
Add beans and corn, and cook 2 min/100°C/Reverse/speed 1.
Serve garnished with herbs and with a dollop of sour cream (or yoghurt) to taste.