Greek Walnut Spice Cake

Name: Greek Walnut Spice Cake
Ingredients: 1 teaspoon ground cinnamon; 2/3 cup low-fat Greek yogurt; 2 large eggs, at room temperature; 2 teaspoons baking powder; 1 small strip orange zest (1-by-1-inch); 2 teaspoons freshly grated orange zest; 1/4 teaspoon ground nutmeg; 3/4 cup packed dark or light brown sugar; 1/2 cup orange juice; 1/2 cup barley flour (see Note); 1/4 cup packed dark or light brown sugar; 1/2 teaspoon baking soda; 1 1/2 cups white whole-wheat flour (see Note); Cake; 3/4 teaspoon ground cloves; 1 1/4 cups coarsely chopped walnuts, divided; 1/3 cup orange juice; 1/4 teaspoon salt; 1/4 cup extra-virgin olive oil Syrup; 2 whole cloves