The Best Chicken and Sweet Leek Pie with Flaky Pastry
2 tbsp olive oil
2 tbsp butter
2 1/2 lbs free-range boneless & skinless chicken thighs, cut into bite size pieces
2 leeks, trimmed, washed and cut into 1/2″ pieces
3 carrots, peeled, quartered lengthwise and chopped (1/4″) (organic preferably)
3 stalks of celery, quartered lengthwise and then finely sliced [...]