First off, heat the olive oil in a large saucepan and saute the onion, garlic, ginger, chilli and leeks until translucent.
Next add the spices and allow to fry for a minute or two.
Then you add your veggies – the carrots, celery, lentils, corn and peas. Allow to cook for a few more minutes getting them infused with the spices.
Add the liquid stock and leave to cook until the veggies are soft and the liquid reduced. Add the spinach and give it a good mix through.
In the meantime, cook your sweet potato with a sprig of rosemary until soft. Drain, remove the rosemary and mash. Chop some thyme leaves and add it into the mash. Season.
Scoop the cooked vegetables into an oven safe dish, and top with mashed sweet potato and bake in a hot oven (180 degrees C) for 20 minutes until bubbly and roasted.