Hearty Vegetarian Sausage Rolls with Lentils

There are few things more welcome on a teatime table than a tray of warm sausage rolls, their pastry shattering at the first bite. The trouble is that the traditional version relies on pork, which leaves vegetarians reaching for the cucumber sandwiches. The answer, happily, is lentils. Cooked until tender and combined with mushrooms, they give you that dense, savoury, slightly coarse texture that makes a sausage roll so satisfying — and they take on herbs and spice with real enthusiasm.

Why Lentils Make a Brilliant Filling

Lentils are cheap, quick and excellent at mimicking a coarse meat filling. Cooked green or brown lentils hold their shape, so they give you that dense, slightly crumbly bite rather than a purée. Mushrooms bring the savoury depth a vegetarian roll needs, while a spoonful of tomato purée and a splash of vegetarian Worcestershire sauce add the salty, umami notes a pork sausage would normally supply.

Unlike a meat filling, this one carries herbs beautifully. Thyme, oregano and a little fennel seed give it the herby, gently aniseed character of good British sausage meat, and the whole mixture comes together in one pan in under half an hour.

The Filling: What You Need

This makes enough for one 320g sheet of ready-rolled puff pastry — eight generous rolls or ten dainty ones. Double it if you are feeding a crowd, as the filling freezes well.

• 250g cooked green or brown lentils (about 100g dried), drained and patted dry
• 200g chestnut mushrooms, finely chopped — they have far more flavour than white ones
• 1 onion, finely chopped, and 2 garlic cloves, crushed
• 1 tbsp olive oil
• 1 tbsp tomato purée and 1 tbsp vegetarian Worcestershire sauce (or soy sauce)
• 1 tsp dried thyme, 1 tsp dried oregano and 1 tsp fennel seeds, lightly crushed
• 50g fresh breadcrumbs — they soak up moisture and keep the filling light
• 320g ready-rolled puff pastry, vegetarian
• 1 egg, beaten, or a little milk for glazing

Cooking the Filling — and Why Chilling Matters

Warm the oil in a wide frying pan over a medium heat and cook the onion for 8–10 minutes until soft and beginning to catch at the edges. Add the garlic, cook for a minute, then tip in the mushrooms. Turn the heat up and cook for 8–10 minutes, stirring often, until their liquid has evaporated. This is the step people rush and the one that matters most: wet mushrooms mean soggy pastry.

Stir in the tomato purée, Worcestershire sauce and dried herbs and cook for a minute until fragrant. Add the lentils and mash them roughly with the back of a wooden spoon — you want texture, not a purée. Cook for another two or three minutes to drive off any remaining moisture, then take the pan off the heat and stir through the breadcrumbs. Season generously with salt and black pepper. Taste it now: it should be a touch more seasoned than seems necessary, because the pastry will mute the flavour.

Tip the filling into a bowl, cool completely, then cover and chill for at least 30 minutes. Cold filling is far easier to shape and will not soften the pastry from the inside.

Wrapping, Sealing and Baking

Heat the oven to 200°C fan (220°C conventional, gas 7) and line a large baking tray with baking paper. Unroll the pastry on a lightly floured surface and cut it in half lengthways into two strips roughly 10cm wide.

Divide the chilled filling in two and shape each half into a log about 2cm thick and slightly shorter than the pastry strip. Rolling each portion in cling film and chilling it for 15 minutes makes this much neater, as the logs hold their shape beautifully.

Lay a log along the middle of each strip, brush one long edge with beaten egg, fold the pastry over the filling and press the edges together firmly. Crimp with a fork, trim the ends, brush the tops with more egg and cut each strip into four or five rolls. Space them on the tray and chill for 20 minutes before baking — this helps the pastry puff evenly and stops it shrinking.

Bake for 25–30 minutes until deep golden and crisp. If they colour too quickly, drop the oven to 180°C fan for the last ten minutes. Let them settle on the tray for five minutes before moving to a rack.

Variations, Serving and Making Ahead

Once the base is right, the filling is a blank canvas. A handful of grated mature Cheddar, a teaspoon of yeast extract, a pinch of smoked paprika, some finely chopped sun-dried tomatoes or a few chopped walnuts all work well — just keep the mixture fairly dry.

Serve them warm or at room temperature, never straight from the oven when the filling is molten, with piccalilli, sharp tomato chutney or a dab of English mustard. They sit happily alongside a bowl of soup or a simple green salad.

Make them ahead and keep them in the fridge for up to three days; reheat at 180°C fan for 8–10 minutes. To freeze, open-freeze the unbaked rolls on a tray, then bag them. Bake from frozen at 200°C fan for 35–40 minutes, adding a few minutes if needed.