Use hot coffee in the batter; it deepens the chocolate without tasting like coffee. Room-temperature eggs and buttermilk matter, so give them twenty minutes on the counter. Break the ganache? Add a splash of warm cream and whisk hard; it comes back. Store the assembled cake covered in the fridge up to 2 days, but add the fresh strawberries within 3 hours of serving. Serve at room temperature; cold ganache is tough. Dairy-free swap: non-dairy milk plus lemon juice for buttermilk, whipped coconut cream for the filling, dairy-free dark chocolate for the ganache.