Preheat oven to 350°. Pour boiling water and orange juice over cranberries in a small bowl; let stand 5 minutes. Drain., In a large bowl, cream butter and sugars until light and fluffy. Beat in egg, orange zest and vanilla. In another bowl, whisk flour, salt, cream of tartar and baking soda; gradually beat into creamed mixture. Stir in pecans and cranberries., Drop dough by tablespoonfuls 3 in. apart onto ungreased baking sheets. Bake until until edges begin to brown, 10-12 minutes. Remove from pans to wire racks to cool. Store in an airtight container.