I actually used a 7 inch Springform pan this time around but I think an 8 or 9 inch pan works the best. The thicker the cake the harder it is to really get those liquids to soak. Any of those options are fine, or you could double the recipe and use a 9x13. **I actulally used one of those syringes for giving Hugo medicine for this step. (Clean of course.) I would pull up the liquid and then literally "inject" it into the sides and top of the cake. It worked surprisingly well! Base recipe adapted from Williams Sonoma