Cut 4 pieces of greaseproof paper or baking parchment, each measuring approximately 30cm square. Put each chicken breast onto a separate square of greaseproof paper.

Mix the vegetables together and place an equal amount on top of each piece of chicken. Sprinkle with 5-spice powder (if using), the ginger, soy sauce and black pepper.

Fold up the paper to wrap up the chicken completely. Put the parcels into a steamer, cover and steam for 35 to 40 minutes.

Check that the chicken is properly cooked by unwrapping one of the parcels and inserting a sharp knife into the thickest part. The juices should run clear with no traces of pink.

Serve the chicken in the parcels, along with vegetables and noodles, rice or potatoes.