Rinse the lentils, cover with 750 ml (3 cups) of water and bring to a boil over high heat. Simmer over medium-low heat until tender, about 20 minutes, then drain.
Dice the onion and red pepper into small 1 cm (1/2 inch) pieces.
Heat the oil in a large skillet over medium heat and cook the onion and pepper, stirring, until soft, about 5 minutes.
Add the lentils, tomato paste, diced tomatoes, maple syrup, mustard, apple cider vinegar, chili powder and soy sauce. Simmer over medium-low heat, stirring often, for 10 minutes until thick.
Toast the buns cut side down in a dry pan over medium heat for 1 minute.
Pile the filling onto the buns and top with coleslaw mix.
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