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In a large bowl sift together flour and salt.
Cut in the butter until mixture resembles cornmeal.
In a small bowl mix the egg and sour cream together.
Add this to the flour mixture and work it in quickly until dough forms a ball.
Divide in half, wrap in plastic and chill for 1 hour.
Serving: 375g | Calories: 710.3kcal | Carbohydrates: 95.9g | Protein: 16.6g | Fat: 28.2g | Saturated Fat: 16.4g | Cholesterol: 169.7mg | Sodium: 785mg | Fiber: 3.4g | Sugar: 0.6g