Rinse the lentils, cover with 750 ml (3 cups) of water in a saucepan and bring to a boil over high heat. Simmer over medium-low until tender, about 20 minutes, then drain.
Dice the onion and red pepper into small 1 cm (1/2 inch) pieces.
Heat a large skillet over medium-high heat. Add the turkey, onion and pepper and cook, breaking up the meat, until no pink remains and it reaches 74°C (165°F), about 8 minutes.
Stir in the lentils, tomato paste, diced tomatoes, ketchup, Worcestershire sauce, mustard and chili powder. Lower the heat to medium and simmer, stirring often, until thick, about 10 minutes.
Toast the buns cut side down in a dry pan or under the broiler for 1 minute.
Pile the filling onto the buns and top with a little coleslaw mix.
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Tips
Swaps
Gluten-free: gluten-free buns and check the Worcestershire.