I disagree that you need double the pot size to cook. As for boiling over, my food never boils over. When I cook it is a full-time job- full time stirring and turning down the heat if needed. The question posted was what was the MINIMUM size needed. I will stand by my first statement - 1.0-1.3 liters should do. That is not to say that a 2-liter pot isn't a nice luxury - but not minimally needed.