Chicken Pot Pie

INGREDIENTS

3 tbsp unsalted butter

1 onion, finely chopped

3 carrots, peeled and sliced into half-moons

1 tbsp coarse-grain mustard

1/4 cup all-purpose flour

1 cup reduced-sodium chicken broth

1 cup milk, plus 1 tbsp for top

3 cups chopped cooked leftover chicken

1 cup frozen peas

1 tbsp dried parsley, or thyme

1 tsp salt

1/2 tsp black pepper

1/2 of 397 g frozen puff pastry, thawed

1 egg

2 tbsp toasted sesame seeds, optional

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