Japanese yam pasta sauce

I wanted to make a creamy pasta sauce and obvi couldn't use dairy. I remembered that sweet potatoes can be blended to a creamy consistency. At the grocery store all there was was japanese yams.. so that is what I used, and it was beyond yummy

recipe follows 

Ingredients:

2 medium sized japanese yams 

olive oil

salt 

half a head of cilantro 

pepper

vegetable stock 

any other herbs, seasoning you desire

Bring a large pot of water to boil

skin and dice the yams then add to the boiling water

remove from water once a fork can easily be inserted 

now add half the yams to your blender and add all other ingredients 

- now I did not measure anything but you basically add the olive oil and stock to taste and to desired consistency, I promise you it's easy 

keep tasting and adding, add to your pasta and serve with what evaaaa your heart desires