Place pumpkin seeds and chilli into Thermomix bowl and mill 20-40 sec/speed 8 or until a thick paste forms.
Chargrill whole tomatoes under a hot grill for around 10-15 minutes, turning as needed, until skin is well blackened and flesh is soft. Cool slightly.
Add to Thermomix bowl with all the juice and remaining ingredients except oil.
Blend 10 sec/speed 8, stopping to scrape down sides of bowl as necessary.
Add oil to mixture as you blend until you have a solid consistency that is spreadable.