Taste it & add flavors you like.
Wen they are fully cooked & getting thick let them cool & then run through the food processor to grind up the skins (not needed if you use the skinless lentils), then back to the pot on low, stirring often until you have a very thick paste.
Heat oven to 350, make 1 test ball & flatten on parchment, bake until browned & dry in center. If it cracks that means its too wet & you need to cook it in pot a little longer, stirring often. Once you get a good test ball that makes a dry crisp with no cracking, you can remove the pot from heat & let the paste cool. Then roll & flatten a whole batch & bake.
Cool completely on a rack & store in an airtight container. They should not sit out for more than a day because they will ferment (unless you like that sort of thing), after first day store in frig with some uncooked rice tied in cheesecloth or with a food safe "do not eat packet" to keep them crisp. If they lose their crunch you can warm them in oven to crisp up again.