Soak ancho and chipotle chilli in boiling water for 20 mins.
While the chilli are soaking, add garlic and onion to mixer bowl and chop for 3 sec/speed 9/MC on. Scrape bowl down.
Add oil to mixer bowl and cook for 7 min/100°C or 212°F/speed 1/MC off.
When the chillis have finished soaking, remove the stems from each chilli and deseed the ancho. Set the chipotle aside.
Put the ancho in the mixer bowl with the remaining ingredients (except the chipotle) and blend for 1 min/speed 9/MC on.
Add the chipotle chillis to the bowl and cook for 15 min/steaming temp/slowest speed/MC off. Put your simmering basket over the hole to avoid making a mess!