With a paring knife, cut strawberries lengthwise, through the top, leaving leaves on each side. Remove a small portion of the center to create a cavity. Set aside.
In a small bowl, mix blue cheese and crushed walnuts until combined.
To prepare, lay ½ strawberry over the center of a ribbon of prosciutto, cavity side up. Wrap prosciutto around and over the front.
Place a dollop (½ tsp) of cheese mixture in the center of each strawberry half. Serve immediately.