Unroll crescent dough and arrange triangles in a circle on the baking sheet with points facing outward, forming a ring. Layer provolone slices over the dough, then spread the steak and vegetable mixture evenly on top. Fold the dough points over the filling and tuck underneath the ring to seal.
Brush the assembled ring with beaten egg and sprinkle with sesame seeds if desired. Bake in the preheated oven for 20 to 25 minutes until the crust is golden brown.
Allow the ring to cool slightly on a wire rack before slicing into portions and serving.