Chocolate-Mixed Nut Tart

Ingredients  

• Butter Pastry (see recipe below)
• 4 eggs
• 1 1/4 cups light-colored corn syrup
• 3/4 cup sugar
• 1/4 cup unsalted butter, melted
• 1 teaspoon vanilla
• Dash salt
• 1 1/4 cups salted mixed nuts
• 1 cup miniature semisweet chocolate pieces
• 1 tablespoon shortening
• Sweetened Whipped Cream (optional)