The Filipino dish of lumpia Shanghai shows the influence of Chinese settlers on the Southeast Asian country’s cuisine. I’ve eaten them many times at restaurants and parties – because no Filipino celebration seems complete without a big pile of lumpia on the buffet table – and no two versions were the same. The only things they had in common were that they were deep-fried, and the filling consisted of lots of vegetables and some pork. This recipe makes a lot of lumpia, but they freeze well. They...