All I had to do was add one egg and some water...the mix is poured into a muffin tin that has had oil warmed up in it.
First of all I decided maybe I could just use cooking spray in place of the oil. Nope! When I took the tin out of the oven there was just some blackish liquid inside. I took out another muffin tin and this time put in a small amount of corn oil. Wanting to save the calories - I just put a dribble in each opening which I think was a mistake.
The puddings never did rise much about the edge of the tin, which I'm thinking was due to the lack of oil (??) - I may have also opened the oven before they were finished - which is a "no no".
When I tasted the yorkshire pudding it had a very familiar texture. Ds said "it tastes just like french toast without anything on it". And actually it did. Ok I just realized the texture - like biting into one of those twisty shaped donuts (cruellers?) that are super soft...kind of a moisty chewiness inside, but not sweet like the donut.
It didn't taste like a biscuit at all. The kids did not ask for seconds as they normally would with biscuits or homemade buns or rolls - and dd said "it has a strange taste".
Here is a recipe for making yorkshire pudding from scratch (most foods taste better from scratch - so I imagine the puddings would). Also, typically the puddings are served with gravy or baked in a pan with some beef drippings - that would definitely improve the flavor. Here is another version of the recipe - this one baked in a small square pan instead of muffin tins.
Here is an explanation of why it's called "pudding", and here is some additional information on yorkshire puddings.