Curried pumpkin and lentils

Ingredients (6 servings): 1 tablespoon vegetable oil 2 brown onions, finely chopped 3 garlic cloves, peeled, thinly sliced lengthways 2 x 7cm cinnamon sticks 3 large fresh green chillies, thickly sliced 1 tablespoon black mustard seeds 3 teaspoons ground cumin 3 teaspoons ground turmeric 500g butternut pumpkin, peeled, deseeded, cut into 4cm pieces 305g (1½…