Make your own, SJ - dead easy
Ingredients
8 ounces/225 grams dried marrowfat peas (available in supermarkets)
2 tablespoon baking soda
Salt (to taste)
Pepper (to taste)
Sugar (to taste)
Place the peas in a large bowl or stock pot, the peas will swell and so need plenty of room to expand. Add the baking soda and cover with 1/2 pint boiling water and stir to make sure the baking soda has dissolved.
Add the peas and leave to soak overnight, or for a minimum of 12 hours.
Drain the peas in a colander, then place in a large saucepan.
Cover again with cold water and bring to the boil.
Lower the heat and simmer for approximately 30 mins or until the peas have softened and turned mushy.
Season with salt and pepper to taste.
I quite like some chopped chives in them too but that's personal.