Heat one tablespoon of oil in a heavy-bottomed pot. Add the cumin and a couple of cinnamon sticks. As soon as they begin to sizzle, add the diced rutabaga and coat it in oil.
Spread the rutabaga in a single layer at the bottom of the pan and cook for about 5 minutes on medium heat. Add 1/2 cup of water to cover the rutabaga completely, and cook on medium-low heat for 10 minutes. The rutabaga will turn a light orange colour.
3. After 10 minutes, remove the lid and cook the rutabaga until all the water has evaporated. Poke a sharp knife or toothpick into the pieces; if they are still firm, add more water and cook until soft. Once all the water has evaporated, push the rutabaga aside in the pan and add the onions and ginger. Cook for a couple of minutes until the onions become soft and translucent.
Stir the rutabaga around to mix it with the onions and ginger, then add turmeric, cumin, chili powder, salt, and sweetener, if using. Reduce the heat a little so it doesn’t burn. If the middle of the pan starts to burn, add 1 to 2 tablespoons of water to loosen the residue stuck to the bottom.
Mash the rutabaga a little with a fork or masher to make it thick and sticky. This helps the filling stay in place when folding your samosa. Switch off the heat, add the peas, and keep the filling covered to cook them through.
Cool in the pan until ready to fill inside your choice of wrapper or pastry, or once cooled, transfer to a storage container and keep it in the fridge until needed.