Chocolate-Peanut Butter Tart

INGREDIENTS

• 1 cup all-purpose flour, plus more for rolling
• 1/4 teaspoon salt
• 1/3 cup unsweetened cocoa powder (preferably Valrhona)
• 1 stick unsalted butter, softened
• 1/4 cup sugar
• 1 large egg
• 1 teaspoon pure vanilla extract
• 2 tablespoons heavy cream
• 1/2 cup sugar
• 2 tablespoons unsalted butter
• 1 tablespoon light corn syrup
• 2 tablespoons water
• 1/4 teaspoon baking soda
• 3/4 teaspoon salt
• 6 ounces (1 1/2 cups) cocktail peanuts, finely chopped in a food processor
• 3/4 cup smooth peanut butter
• 3/4 cup heavy cream
• 5 ounces semisweet chocolate (61 percent), chopped
• Pinch of salt