Preheat the oven to 350F and line two large baking pans with parchment paper.
In a medium saucepan, combine the lentils and water, and bring to a boil. Reduce the heat and simmer for 8 to 10 minutes, or until the lentils are tender but not yet mushy. Strain off excess water and set aside.
Add the sunflower seeds to a food processor and process for one minute, or until ground into a coarse flour.
Then, add the cooked lentils, pumpkin purée, and all remaining falafel ingredients to the food processor. Pulse 10 to 15 times to coarsely chop and mix. You want everything to be well-incorporated but be careful not to over process or you'll end up with hummus.
Use a cookie scoop to scoop out a heaping 1 ½ tablespoons of the falafel dough (it will be quite damp and limp), drop on the pan, and gently press the top down to form into a small patty (about ¾-inch thick), place on one of the lined baking trays, and repeat. (Note: If the dough is sticking to your hands, lightly grease them with oil before pressing.) You should have about 28 falafel patties.
Bake for 18 to 22 minutes, or until the exteriors are just beginning to appear crisp and golden. Do not overbake.
Let the patties cool on the pan slightly before moving or serving.
Leftovers can be refrigerated for up to 1 week or frozen for up to 1 month.
