Thought this looked fun!
My kitchen tip is about Buttermilk.
I never seem to have buttermilk (because I've never bought it, duh). So, I make it myself. All I do is mix 1Tablespoon of lemon juice for every cup of milk. I add the juice to a measuring cup, measure out how ever much milk in the same cup. Stir. Then let it sit for 5 minutes. The acid in the juice sours the milk (buttermilk is basically sour milk).
So, there you go. My tip for Tuesday.