Food and recipes

Hello Everyone!
I was doing some research earlier on the highest calorie foods for those who don't mind, or even desire to be unhealthy. Vegetable oil turns out to be very high up there.
So now, I am trying to design a weight gain shake based around vegetable oil
Ultimately, I want this to be tasty though. After all, gaining for a feedee is more fun when its, you know, enjoyable on all ends of the experience!
So what do you all suggest I add to make a tasty shake?
Other high calorie to low price ingredients preferred if possible, since thats why I am working this around vegetable oil in the first place.

Do not drink oil in large quantities, unless you want to live on the toilet

Fats don't digest well unless you bind them to carbs and proteins. This is why just straight up drinking heavy cream doesn't work very well.

People always want shakes, but American-style pudding consistency digests sooooooo much better. Look into how Soylent is made if you're really dedicated to the oil shake method, we guess.