Mary Berry Runner Bean Chutney Recipe 🌱 | Preserve Summer's Bounty

Ingredients

• 1.2 kg (2 lb 10 oz) runner beans
• 3 large white onions, chopped
• 700 ml (1 1/4 pint) white wine vinegar
• 400 g (14 oz) light brown soft sugar
• 1 tbsp ground turmeric
• 1 1/2 tbsp mustard seeds
• 1/2 tbsp English mustard powder
• 1 tbsp nigella seeds
• 65 g (2 1/4 oz) cornflour
• Salt