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4–6
Easy
45 min
Published 2013
Traditionally, bone marrow is used in this recipe, but you can leave it out if you prefer, adding an extra 40g/1½oz of butter instead. As the dish is from Lombardy, the cheese used is Grana Padano, not Parmigiano Reggiano; and saffron powder is more often used throughout Italy than the strands.
Put the onion in a bowl, cover with cold water and leave to soak for 10 minutes (this will soften the flavour of the onion and make it sweeter, but this stage is optional). Drain the onion and squeeze it dry in a clean tea towel.
Heat half the butter in a deep, heavy-based pan over a low heat. Add the onion and beef marrow, if using, and fry gently for 10 minutes until the onion is soft
