Saute onions and carrots (roughly chopped) for 5 mins.
Add sweet potatoes (roughly chopped) further 3-5 mins
Add other ingredients. Bring to a boil and simmer for 10-13 mins

Thicken by adding liquid (using a sieve) to a blender and a small amount of potato. Blend and add back to the curry.

Serve with Udon noodles cooked to the package directions.