Beef, Mushroom, and Onion Tart

525 calories; 23 g total fat; 10 g saturated fat; 1 g polyunsaturated fat; 7 g monounsaturated fat; 74 mg cholesterol; 1041 mg sodium. 507 mg potassium; 49 g carbohydrates; 2 g fiber; 2 g sugar; 31 g protein; 1 g trans fatty acid; 146 IU vitamin a; 2 mg vitamin c; 0 mg thiamin; 0 mg riboflavin; 6 mg niacin equivalents; 0 mg vitamin b6; 24 mcg folate; 2 mcg vitamin b12; 131 mg calcium; 4 mg iron;