Potato Salad

4 small sweet potatoes (1kg in total), 5 tbsp olive oil, 40ml balsamic vinegar, 20g caster

400g baby potatoes, 125ml (1/2 cup) greek yogurt (soured cream), 1 small garlic clove, crushed,

2 small golden or white potatoes, washed and quartered, 2 cobs sweet corn, 1/4 cup red onion,

6 cups yellow flesh potatoes, chopped with skin on, 1 bunch dill, chopped, 1 red pepper, chopped,