Cheese Matzo Blintzes with Asparagus and Dill

2 1/2 cups whole milk

11/3 cups matzo meal

4 large egg s

1/4 cup vegetable oil plus additional for brushing skillet

1/2 teaspoon salt For filling

1 pound medium asparagus , trimmed

3 cups small-curd cottage cheese (4% milkfat; 24 ounces)

1/4 cup finely chopped fresh dill

1 large egg , lightly beaten

1/2 teaspoon black pepper

1/4 teaspoon salt For topping

1/2 stick ( 1/4 cup) unsalted butter

2 bunches scallion s, trimmed and cut into 1-inch pieces

1/4 teaspoon salt

1/4 teaspoon black pepper

2 tablespoons chopped fresh dill