Apple Sunflower Strudel

Ingredients

• 1 2/3 cups all-purpose flour
• 1/4 teaspoon salt
• 1 tablespoon vinegar
• 2 tablespoons sunflower oil
• 1 egg, slightly beaten
• 1/4 cup warm water
• 1/4 cup granulated sugar
• 1/2 cup brown sugar, packed
• 2 tablespoons cornstarch
• 1 1/2 teaspoons ground cinnamon
• 5 1/2 cups tart apples, chopped
• 1 1/2 tablespoons lemon juice
• 1/2 cup, plus 2 tablespoons raw sunflower kernels (divided)
• 2 tablespoons, plus 1 teaspoon butter (divided)
• 2 teaspoons honey
• vanilla ice cream (optional)