Sweet potato, spinach and caramelised onion quiche

Sweet potato, spinach and caramelised onion quiche


  1. Preheat your oven to 180ºC (160ºC fan) and grease your tin.
  2. Have the pastry at room temperature so it is easy to roll.
  3. Sprinkle a little flour onto your bench and roll out the pastry until it is large enough to line the tin and about 2mm thick.
  4. Place and press into the prepared tin and leave to rest on the side for 20 minutes. Trim any excess pastry off the edges.
  5. While the pastry is resting, place the sliced onions into a frying pan with butter and olive oil. Sauté on a medium heat until they are translucent and soft (about 10 minutes). 
  6. Turn the heat down. Sprinkle the brown sugar over the onions, stir through and cook gently until the onions are syrupy and caramelised (about 5 minutes). Leave to cool, then tip the onions into a sieve to drain off any liquid.
  7. Whisk the eggs, double cream, nutmeg, salt and black pepper together in a large bowl. Put the cooked and drained onions in a layer on the pastry and cover with half of the spinach then a layer of sweet potato slices. Add another layer of spinach and finish with the remaining sweet potato – remember that sweet potato needs to be on the top, as the spinach will burn. 
  8. Slowly pour the egg mix over the filling, taking your time so it soaks right through and doesn’t pour over the edges. Bake for 50 minutes until the top of the quiche is firm to touch and no egg mix oozes out when a knife is stuck into the middle.
  • This quiche keeps in the fridge for four days. To reheat, give it a minute in the microwave and then finish it off in a 180ºC (160ºC fan) oven.




Finish with a top layer of sweet potato on the quiche to protect the spinach from burning in the oven and serve with a side salad!


For the base:
200g puff pastry
plain flour for dusting

For the filling:
2 large white onions, peeled and thinly sliced
25g salted butter
a splash of olive oil
30g dark brown sugar
6 large eggs
300ml double cream
2 tsps nutmeg
1 tsp sea salt
1 tsp cracked
black pepper
60g spinach
2 medium sweet potatoes,
peeled and cut into 5mm slices
23cm loose-bottomed tart tin


Time: 45 mins
Serves: 6
Nutrition: n/a