Hasselback sweet potatoes with caper salsa & feta

Name: Hasselback sweet potatoes with caper salsa & feta
Prep time: 15 min
Cook time: 40 min
Total time: 55 min
Cuisine: European
Ingredients: 4 large sweet potatoes; 4 tbsp extra virgin olive oil; Small handful parsley; Small handful mint leaves; 1 tbsp nonpareille capers; 1 small garlic clove, crushed; 1 tbsp dried red chilli flakes; 2 tbsp white or red wine vinegar; 100g feta crumbled (or more to taste)