Rack of lamb on Welsh onion cake

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By: Eleanor Smallwood

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This recipe is classed as easy

Rating 3.89 / 5 (27 votes)

Prep time:
14 min
Cook time:
1 hr 20 min

Eleanor Smallwood’s Teisen nionod, or onion cake, is Welsh comfort food at its best – layers of potatoes and onion baked in butter until meltingly soft


1. Preheat the oven to 200C/gas 6.

2. Peel the potatoes and slice very finely with a mandolin or sharp knife. Toss with the melted butter and season with plenty of salt and black pepper.

3. Brush a shallow ovenproof dish with a little a little more melted butter. Layer the potato and onion in the dish, starting with potato and finishing with a neat layer of overlapping potato slices. Drizzle any remaining butter over the top.

4. Cover the dish with foil and bake in the oven for 1 hour. Meanwhile, take the lamb out of the fridge to come to room temperature.

5. After the onion cake has had an hour in the oven, remove the tin foil. Sit the lamb racks on top with their bones interlaced and tuck the rosemary sprig in the middle. Return to the oven for 15-25 minutes, depending on the size of the racks and how you like your lamb cooked. By now the potatoes should be beautifully tender and browned on the top.


  • 800 g floury potatoes, such as King Edwards or Maris Piper
  • 100 g melted butter
  • 400 g white onions, sliced
  • 2 racks of lamb, each with 6 bones
  • 1 sprigs rosemary

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Latest Comment


the recipe has a lot of 5 stars for a good reason;it was yummy! my partner and i wolfed it down, kids loved the lamb but not so keen on onion cake. i dont think it will become a regular favourite simply because the racks of lamb were so expensive.£12 per rack at my local butchers because i needed 7 chops per rack to feed 5.he did me a deal and gave me 2 for £20. will definately have it again, but just for me and my boyfriend as the kids didnt like the onion cake,i loved it.

christineP22 christineP22  Posted 03 Dec 2012 1:05 PM

this recipe has a lot of 5 stars. going to cook it tonight. will let you know how it turns out!

christineP22 christineP22  Posted 29 Nov 2012 11:24 AM

oops forgot to rate it haha !!

fionaB27420 fionaB27420  Posted 04 Apr 2011 8:10 AM

we are having this for dinner for the second time i found this very easy to make,however really nice we love our lamb and potatoes maybe because we are scottish !

fionaB27420 fionaB27420 Posted 04 Apr 2011 8:09 AM

Easy peasy with a great end result - very tasty. I'm sure it will become a regular favourite.

SandraA72832 SandraA72832 Posted 09 Jan 2011 8:42 PM

JillG85841 JillG85841 Posted 08 Oct 2009 9:12 AM

very easy recipe to follow. taste is fantastic.

elmo5 elmo5 Posted 19 Jul 2009 10:45 AM

elmo5 elmo5 Posted 19 Jul 2009 10:42 AM