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Red onion tart with watercress pesto and roasted cherry tomatoes

Keri Astill-Frew / 13 December 2018

A tasty tart bursting with the flavour of sweet caramelised red onions, roasted cherry tomatoes and peppery watercress and hazelnut pesto.

Red onion tart with watercress pesto and roasted cherry tomatoes
Red onion tart with watercress pesto and roasted cherry tomatoes

Preparation time

25 minutes

Cooking time

15 minutes




  • 1 sheet of puff pastry (suitable for vegans - we used Jus-Rol)
  • 4 red onions, finely sliced
  • 1 tbsp sugar
  • 1 tbsp red wine vinegar
  • 2 sprigs fresh thyme (or 1 tsp dried)
  • 1 head broccoli, cut into small florets
  • Juice and zest of ½ a lemon
  • 75g watercress
  • ½ a clove of garlic, finely chopped
  • 35g toasted hazelnuts
  • 250g cherry tomatoes on the vine
  • 100ml extra virgin olive oil plus a bit extra
  • Salt and pepper


1. Place a medium heavy-based saucepan onto a medium heat and add in a splash of oil. Once the oil is hot, add in the sliced red onions and fry for 5 minutes or until beginning to caramelise, stirring occasionally. Add in the red wine vinegar and sugar then reduce heat to low and continue to cook until onions are completely softened, and the liquid has reduced to a sticky consistency (about 15 minutes). Remove from the heat and allow to cool.

2. Next make the pesto by adding the watercress, hazelnuts and garlic to a food processor with the olive oil. Blend for a couple of minutes then remove the lid and scrape down the sides and pulse a few times to ensure no big chunks are missed. Season to taste then set the pesto aside.

3. Place the broccoli florets into a bowl and drizzle with a little olive oil. Add a pinch of salt and pepper then toss to coat evenly.

4. Preheat your oven to 200°C. Take your pastry sheet and cut it into 4 equal rectangles. Place the rectangles on a baking tray. Spread the pesto thickly onto the pastries, leaving a 1cm border around the edge. Take a spoon and scatter the red onion mixture over the top evenly. Dot with the broccoli florets then put the baking tray into the oven. Bake for 10-15 minutes or until the pastry around the edges is risen and golden.

5. While the tarts cook, prepare the tomatoes. Use a pair of scissors to snip them into four equal sized portions, keeping as many tomatoes attached to the vine as possible. Place onto a baking tray, drizzle with olive oil and season with a little salt and pepper. Place into the oven with the tarts for the last eight minutes of cooking.

6. Finally remove your tarts and tomatoes from the oven and serve hot. For a different variation why not try swapping the broccoli for asparagus, kale or green beans.

Our thanks to for providing this recipe

Visit our vegan recipe section for more meat-free cooking ideas

The opinions expressed are those of the author and are not held by Saga unless specifically stated.

The material is for general information only and does not constitute investment, tax, legal, medical or other form of advice. You should not rely on this information to make (or refrain from making) any decisions. Always obtain independent, professional advice for your own particular situation.