In a bowl, cream together the butter, canola oil, granulated sugar, powdered sugar, water, and vanilla extract. Then add in eggs and blend to combine.
Add in the baking soda, cream of tarter, and salt. Blend to combine.
Then add in cocoa powder and flour. Blend just until combined,
Shape dough into golf ball sized balls. Place 6-8 on your cookie sheet depending on how large it is. Then dip the bottom of a drinking glass in sugar and then press the golf ball sized dough down until about 1/2 inch thick and the edges get that crinkly effect.
Bake for 8-10 minutes. This is a little tricky because the cookie will look under done. they really don’t get any color to them. They will just look firm. Do not over bake.
Allow cookies to cool and then refrigerate for true Swig style.
For the frosting, cream the butter, sour cream, cocoa powder, sugar, and vanilla together until well blended. If you need to you can add a little milk if needed. I didn’t think it needed any. Makes 24 cookies.