Dark Chocolate Chunk Walnut Cookies

Ingredients

• 1 egg
• 1/4 teaspoon salt
• 1/2 teaspoon baking soda
• 1 teaspoon vanilla extract
• 1/2 cup packed brown sugar
• 1/2 cup white sugar
• 1/2 teaspoon cream of tartar
• 1/2 cup butter (softened)
• 1/2 cup chopped walnuts
• 1-1/2 cups all-purpose flour
• 1 teaspoon hot water
• 1 cup dark chocolate chunks