Ganache Pâtisserie is excited to announce its newest creation for this upcoming Valentine’s Day.  Saint Valentin Noisette Mango Chocolat 2012 ($24.95) starts with a dark chocolate mango mousse layered with a chunky mango compote, moist chocolate cake and a foundation of caramelized banana cremeux, caramel crunch and a hazelnut shortbread base.  The entire gâteau is…