Split Pea& Sweet Potato Soup With Mint

• 2 sweet potatoes (peeled)
• 2 sweet apples see note
• 1 onion coarsely (chopped)
• 1 bay leaf
• 950 ml water
• 400 gr split peas (dried rinsed)
• 475 ml vegetable stock
• 28 gr sweet butter
• 1 gr mint (dried)
• 3 slices stalks celery (sliced)