My dad cooked dulce de membrillo every year :-) When you're boiling quince with sugar you have to keep stirring the paste to stop bubbles from forming. Those d

My dad cooked dulce de membrillo every year :-) When you're boiling quince with sugar you have to keep stirring the paste to stop bubbles from forming. Those damned bubbles burn bad in your hands, so when you start you cannot stop until it all done.