Wash lemon, grate dry and tear off zests from the peel. Cover the zests with damp kitchen paper. Halve the lemon and squeeze 1 half. Peas pollen. Bring cream, milk and 1-2 tablespoons lemon juice to the boil.
Season sauce with salt and pepper and simmer for 3-4 minutes, then add peas. Wash the mint, dab dry and finely chop the leaves of 2 stems. Prepare ravioli in boiling salted water according to package instructions.
Stir the sauce thickener into the sauce and cook for about 1 minute, finally adding the chopped mint. Drain the ravioli. Arrange ravioli and sauce and garnish with mint leaves, lemon zests and coloured pepper.