Double Cherry-Almond Slab Pie

Name: Double Cherry-Almond Slab Pie
Prep time: 1 h
Total time: 1 h
Cuisine: American
Ingredients: 3 3/4 c. all-purpose flour; 1 1/2 tsp. salt; 1 1/2 c. cold, unsalted butter, cubed; 9 tbsp. ice water; 1 1/2 tbsp. apple cider vinegar; 4 c. fresh or thawed frozen sweet cherries, pitted; 1/2 c. dried tart cherries; 1/2 c. sugar; 3 tbsp. cornstarch; 1 tsp. lemon zest plus 1 tbsp. fresh lemon juice; 4 oz. almond paste, diced; 1/4 c. sliced almonds, chopped; 1 large egg, for egg wash; 1 c. powdered sugar; 2 tbsp. whole milk; 1/2 tsp. almond extract