- Preheat the oven to 180°C.
- Heat a little olive oil in a frying pan and cook the onion until softened and translucent.
- Add the garlic, Merchant Gourmet Whole Chestnuts, cavolo nero, tamari and Dijon mustard.
- Cook over a medium heat for 5–10 minutes, stirring regularly.
- Transfer the mixture to a food processor with the oats and pulse until a sticky mixture forms. Keep some texture rather than blending completely smooth.
- Transfer to a bowl and leave to cool.
- Lay the puff pastry on a lightly floured surface.
- Spoon the filling along one long edge of the pastry, leaving a small border.
- Fold the empty side of pastry over the filling and press the edges together with a fork to seal.
- Cut into bite-sized pieces and place on a lined baking tray.
- Brush with olive oil and scatter over the nigella seeds.
- Bake for 15–20 minutes, until golden, crisp and puffed.
- Serve warm or cold with your favourite condiment.
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