Preheat oven to 200°C.
Prick each potato with a skewer and wrap in foil. Place into Varoma dish and V stacker if you have one! Pour water into the Thermomix bowl and set Varoma into position. Steam 35 min/Varoma/speed 4. Test that potatoes are cooked. (This may vary depending on the size and variety of potato used.)
If done, transfer potatoes to oven tray and place into oven for 30 minutes.
Place parsley into clean dry Thermomix bowl and chop 3 sec/speed 7.
Add pesto and umami paste and blend 3 sec/speed 6. Add sour cream and gently stir to combine.
Remove potatoes from oven when ready to serve and top with Pesto Sour Cream and a little pesto.