Josh, i use a small ladel, and evaporate around 30% - 40% off during cooking. I swear by a freshly made base. it starts to deteriorate after 2 days. and freezing does not do the base any favors either. if i am really trying to emulate my locals madras, i always cook a fresh base to work with. Interestingly, my bir chef buddy, says base is best fresh. he always prepared my dishes from the fresh base pot, as opposed to one that is a day old. (thats another bir myth exposed) the curries tasted fab btw. sometimes he used 2 pans and split the dish between them for better taste. not sure why? could be due to more even cooking, or the effect of the seasoned pan?