Grease small oblong baking pan. Brown hamburger w/onions, drain; add tomato sauce, sloppy joe mix and salt. Simmer while preparing crust. Place 1/2 of crescent rolls in pan; pressing seams to seal. Put meat mixture over dough. Sprinkle with cheese. Please rest of crescents on top. Bake at 425 for 15-20 min or till brown.