Spiced lentil stuffed capsicums

Ingredients (serves 4): 4 medium red capsicums [Bell or Green Pepper] (see note) 10g butter 1 stick celery, trimmed, thinly sliced 1 leek, trimmed, thinly sliced 2 garlic cloves, crushed 3 teaspoons ground cumin 1 teaspoon ground coriander 400g can brown lentils, drained, rinsed 400g can diced tomatoes 1 teaspoon vegetable stock powder 1/3 cup fresh…