I think it is better to say when measuring the capacity of a bundt pan or any other, to fill it with measuring cups of water "until it just begins to overflow". The important words are "until it just begins to overflow"; otherwise one person might fill it 1/8-inch from the rim, and another 1/4-inch from the rim. If you measure as I stated, you will get the correct full measurement. I think simply saying to the rim is not accurate enough, and anyone who has done much baking, knows that accuracy is everything!
August 9, 2016 at 9:56pm