Heat oven to 400 degrees.
Grease baking dish, 8x8".
Mix Tuna, Cheese, onion, celery, almonds, lemon juice, egg, salt and pepper.
Mix baking mix, milk and mayonnaise, beat vigorously 20 strokes.
Spread half the dough in dish, top with tuna mixture.
Spread remaining dough over tuna mixture.
Brush with egg yolk.
Bake until deep golden brown, 25 to 30 min.
Serve with Dill Sauce. 6-8 servings.