Put a bit of oil in a pan, and sauté the shallot. Add the curry and garlic powder, and stir to combine. Add remaining ingredients, stir to combine. Let it simmer on the stow for 5 - 10 minutes to meld flavours. If need be add a bit of water.
Meanwhile, cook the bratwursts, ensuring that you pan fry them or grill them to crisp up the skin.
Serve warm over sliced bratwurst, fries or a roll on the side would be good too. Dust with a bit of curry powder.