Pear Gingerbread Muffins

Name: Pear Gingerbread Muffins
Ingredients: 2c (9.2 ounces or 260 g) all purpose flour; 1½ teaspoons baking soda; 1 tablespoon ground ginger; 1 teaspoon ground cinnamon; ¼ teaspoon nutmeg; ⅛ teaspoon ground cloves; ⅛ teaspoon ground allspice; Pinch of mace (optional); ½ teaspoon kosher salt; 6 tablespoons (3 ounces/85g) unsalted butter, melted and cooled; ¼ c dark brown sugar (1.4 ounces/40g); 1 large egg; ½ c (120ml) flavored light molasses; 1 c (240ml) cold water; One bosc (or other baking) pear, diced.