I am building my own cabinet doors and kitchen cabinets,  this is the first I have worked with hardwoods ( for cabinet doors )  they are warping/warped from knots etc. the lumber is dry… I am using alder and am very happy with the results so far.  I know I saw an article/tip somewhere that showed how to fix the warps ( by steaming them??)   does anyone have suggestions on how to fix the warped doors?

thanks