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Cawl Cennin (Welsh leek soup) with quick Welsh Rarebit

A fabulous combination of creamy leek and potato soup with bubbling Caerphilly cheese on toast! Quick to prepare ahead to finish off for a tasty St. David’s supper….

  • 5.0 Star
  • Timer Prep 5 min
    Cook 25 min
  • Chart 714.0 cal/
  • Chef hat Medium


Chop the onions. Slice the medium leeks. Roughly chop the potatoes.


  1. 1 To make the soup, heat the oil in a large pan, add the onion, leek and potato and cook for 4-5 minutes or until softened and lightly coloured.
  2. 2 Add the stock and seasoning, bring to the boil then cover, reduce the heat to simmer for 15 minutes or until the potato is tender.
  3. 3 Whiz with a hand blender to a smooth consistency then reheat, stir in the cream or crème fraiche and adjust the seasoning, to taste.
  4. 4 Meanwhile for the Welsh Rarebit, crumble the cheese and mix with the butter, Worcestershire sauce, mustard and ale or milk. Spread evenly over the toast and cook under a preheated grill for 1-2 minutes to melt the cheese and tinge brown in places.
  5. 5 Ladle the hot soup into bowls and garnish with chopped parsley. Cut the Welsh Rarebit into triangles to enjoy with the soup.

4 Reviews

  • Hannah

    Delicious recipe. Made this yesterday but only added 750ml of stock and half a tub of light Creme fraiche as we like our soup a little on the thicker side. We got 5 portions out of it! Will definitely be making again.

  • Jan

    Enjoyed this comforting soup (made with 700ml veg stock and half tub low fat creme fraiche). Used less cheese (Caerphilly) in the Welsh rarebit, but more ale! Two of us ate the whole lot.

  • Louisa

    Delicious quick and easy

  • Lex

    Flipping delicious

  • Average per serving
  • Calories 714.0kCal
  • Fat50.0g
  • Saturated26.9g
  • Salt3.52g
  • Carbohydrates41.6
  • Sugar11.4g
  • Protein22.1g
  • Fibre6.3g