Deep Dish Tuna Pie

Ingredients

• 1/2 (11 oz.) pkg. pie crust mix (1 1/3 c.)
• 1 c. chopped onion
• 1 medium potato, peeled and diced (2/3 c.)
• 1/2 c. water
• 1 (10 3/4 oz.) can cream of mushroom soup (condensed)
• 1/3 c. milk
• 1/3 c. grated Parmesan cheese
• 1 Tbsp. lemon juice
• 3/4 tsp. dried dill weed
• 1/2 tsp. pepper
• 1 (16 oz.) pkg. assorted frozen vegetables
• 1 can tuna
• 1 beaten egg