Caramelise onions: Cook sliced onions in oil over medium heat, stirring often, until golden. Cool.
Prep pastry: Trim 5cm off the short edge of each pastry sheet (for bows). Cut each sheet in half to make 4 rectangles. Chill.
Make bows: Shape the strips into loops and tails. Press together gently. Chill.
Assemble parcels: Spread tomato purée on half of each rectangle. Sprinkle spices. Add squash, onions & pine nuts. Roll up like a cinnamon roll, tucking in edges. Seal.
Decorate: Score the tops, press on pastry bows.
Brush & bake: Mix oat milk, maple syrup & nutmeg. Brush over the pastry. Bake at 218°C/425°F for 35–45 mins or until golden brown.