Swiss chard season lasts from spring to fall. Its delicate flavor pairs wonderfully with sweet raisins and balsamic vinegar in this savory Sicilian pie.
To make the pastry, combine the flour, vegan butter, and salt in a food processor with ½ cup (120 ml) cold water. Pulse until smooth. Wrap the dough in plastic wrap and refrigerate for 30 minutes.
To make the filling, finely dice the garlic and onions. Heat the oil in a large sauté pan over medium heat. Cook the onions, garlic, and raisins for about 5 minutes,