Mustard-Tarragon Chicken Pot Pies

Ingredients

• 2 sticks unsalted butter
• 312.5 g flour
• 1 tsp salt
• 1 tsp sugar
• 6 Tbsps ice water
• 2 large skinless boneless chicken breasts
• 238 ml heavy cream
• 4 medium diced carrots
• 1 medium diced zucchini
• 5 Tbsps unsalted butter
• 1 large yellow onion
• 5 Tbsps flour
• 235 ml chicken broth
• 60 ml cognac
• 3 Tbsps fresh tarragon
• 3 Tbsps dijon mustard
• 0.5 tsps black ground pepper
• 1 egg
• 1 tsp water