You could add a bit of curry powder to the patties or keep them plain as I did here - pretty much whatever you fancy goes! And just make a big batch when you have time and freeze in portions, so you always have a healthy lunch or snack to fall back on.
150g sweet potato, peeled & grated
1/2 small onion, grated
salt & pepper
oil for frying (I used coconut oil but sunflower or similar would work equally well)
1. In a bowl, mix the grated sweet potato with the grated onion. Squeeze out any excess liquid over the sink (I just take handfuls & squeeze but you could put all of the mix into a clean tea towel & squeeze out the liquid).
2. Add the egg and seasoning and combine everything.
3. Fry gently on a low to medium heat to allow the potato to cook & the cakes to brown. Turn frequently whilst cooking.
4. Serve immediately or leave to cool & freeze.