Sweet Potato Gratin in galangal and chilli

Prep everything first: chop the aromatics, measure the galangal and chilli elements, and pat the sweet potato dry so it colours well.

Warm the olive oil in a large pan over a medium heat and soften the onion and garlic until sweet and translucent, about 5 minutes.

Add the sweet potatoes and slow-cook until it takes on colour and the edges catch, 4 to 6 minutes.

Stir in the kaffir lime leaves and the rest of the galangal and chilli flavours, letting them cook out for a minute until fragrant.

Add the baby potatoes along with a splash of stock or water, then cover and cook gently until everything is tender and the sauce clings.