Sally Bee's Caramelised Veggies And Sausages

Ingredients

• 4 large sweet potatoes
• 450 g (15.9oz) pork sausages
• 1 tbsp olive oil
• 2 onions, peeled and sliced
• 1 garlic clove, peeled and sliced
• 1 tsp fennel seeds
• 100 g (3.5oz) fine green beans, trimmed
• 100 g (3.5oz) cherry tomatoes
• 100 g (3.5oz) grapes
• 2 tbsp apple cider vinegar