Sweet potato salad

INGREDIENTS

• 1.2kg sweet potatoes , peeled and cut into biggish chunks
• 1 tbsp olive oil
• 2 shallots (or half a small red onion), finely chopped
• 4 spring onions , finely sliced
• small bunch chives , snipped into quarters or use mini ones
• 5 tbsp sherry vinegar
• 2 tbsp extra-virgin olive oil
• 2 tbsp honey