Sauté onion, carrot, and celery in butter; stir in flour 1 minute.
Whisk in stock; simmer to thicken. Add chicken and peas; season.
Transfer to dish; top with pastry; cut vents. Bake at 400°F (200°C) for 25–30 minutes until golden.
Pairings
Wine:
Chardonnay (unoaked or lightly oaked) – acid to cut the buttery crust and gravy; Pinot Noir – earthy and light; won't overpower the chicken and peas
Beer:
Golden Ale – gentle malt for the creamy filling; Belgian Blonde – soft fruit and a dry finish