Carefully place the pasta nests in plenty of boiling salted water and cook for 12-15 minutes. Then drain and allow to drain. Meanwhile wash the liver, dab dry and dice. Wash spring onions, mushrooms and cherry tomatoes,
Cut spring onions into rings. Halve mushrooms and quarter tomatoes. Heat the oil in a pan and fry the liver in it for 5-6 minutes until brown all around, remove from the pan and sprinkle with salt and pepper.
Heat butter in the frying fat, fry spring onions and mushrooms until golden brown. Deglaze with cream and stock and bring to the boil. Stir in sauce thickener, bring to the boil again. Season sauce with salt, pepper, nutmeg and white wine.
Add liver and cherry tomatoes and heat. Arrange ragout and nests of pasta on a large plate and serve.