Pa de Sant Jordi

Preparation:
Make three separate doughs: cheese, sobrassada and walnut. For each dough put the flour in a bowl and make a well in the centre. Add the remaining ingredients, mix in until incorporated and knead well.
Cover with a cloth and leave to stand for 25 minutes.
Stretch the cheese and sobrassada doughs to the desired thickness. Cut the cheese (yellow) dough into 5 strips and the sobrassada (red) dough into 4 strips.
Take a rectangular tray, add some oil and dust with flour.
Stretch the walnut dough until it has a similar thickness to the tray and press into the tray.
Place the strips of cheese and sobrassada dough on top of the walnut dough, arranging them vertically like the stripes of the Catalan flag.
Leave to rest until it has doubled in size.
Heat the oven to about 200°C and put in the loaf. The baking time should be 30 minutes but may vary depending on your oven.