Update: Some people are having issues with the lentils not fully cooking. I would recommend soaking the lentils overnight (like you would other legumes) before using to help soften slightly. You could also try cooking the lentils in water only until starting to get tender (20 minutes or so) then add the tomatoes, ketchup, Worcestershire, vinegar, and molasses.
Find it online: https://naturallyella.com/spicy-lentil-vegan-sloppy-joes/