Sweet Potato Gratin

Cooking time
Serves2 people

Sweet potato and peanut butter might sound like a bonkers pairing. Combined with the flavour powerhouses chilli, ginger and lime, the result is magical.

4 ratings
layout 3 comments


  • 3 sweet potatoes
  • A 200ml of coconut milk
  • 1 tbsp peanut butter
  • A stem of lemon grass (optional)
  • A thumb of ginger
  • 1 chilli
  • 1 lime
  • A 250g punnet of cherry tomatoes
  • 2 large handfuls of lamb's lettuce
  • 1 tbsp olive oil
  • Sea salt and freshly ground pepper

Prep: 20 mins | Cook: 55 mins

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1. Heat your oven to 180°C/Fan 160°C/Gas 4.
2. Scrub 3 sweet potatoes, then slice as thinly as you can.
3. Place the slices in a medium sized baking dish.
4. Finely chop a chilli. Peel a thumb of ginger with a teaspoon and roughly chop. Take 1 lemon grass stem and remove the tough outer leaves.
5. Zest the lime and juice half. Tip in 1 tbsp peanut butter, the lemon grass, chilli, ginger, lime zest and the juice into a food processor.
6. Pour in 200 ml coconut milk. Blitz to combine all the ingredients. Taste and season.
7. Pour the coconut sauce over the potato. Mix with your hands, then flatten.
8. Cover the dish with foil and seal the edges tightly. Cook for 30 mins.
9. Dot the tomatoes on top.
10. Remove the foil and cook for a further 20 mins till golden.
11. Check the sweet potatoes are cooked and soft by piercing with a knife. If still firm, place back in the oven and cook for a further 5-10 mins.
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This was insanely delicious! Definitely going into my list of favourite recipes for when friends are over. I first baked in a deep casserole dish but found that only the top layer was really cooking, so transferred halfway through to a larger, more shallow dish, which seemed to work much better (and baked more quickly).



Absolutely delicious! Only change: after blending I sieved the coconut-Lemon-grass mixture as I wanted a smooth texture. I'll have that again very soon.



Delicious gratin with an extra kick from the chilli, lime & lemon grass .. loved by all & even 2nd portions served up .. I added a little bit of grated cheese to the top which worked well .. great recipe to use up some boring veg (ie. potatoes) .. will definitely make it again but don`t think I`ll add the chilli seeds which I did on this occasion