Preheat oven to 220°C.

Wash, spike and cook potatoes whole in microwave for about 6 minutes until soft, turning after 3 minutes.

Dice onions small and fry in about 1 tbsp of Olive oil until glassy.

Wash & roughly chop the spinach. Add to the onions with another drizzle of olive oil and fry for about 2 minutes until limp, season with salt & pepper. Pour in the coconut milk and marmite and stir in over the heat until the marmite is melted and evenly distributed.

Cut the potatoes in half long ways and using a teaspoon, spoon out the potato, leaving a 2mm rim around the edges so the potatoes hold their shape.

Add the spooned out potato to the spinach mixture, breaking the potato up and stirring it in with a metal spoon.

Place the potato jackets on a baking tray and fill them with the spinach mixture - about 1 heaped tbsp in each and then pile them up a bit more if you have extra spinach.

Top with grated feta cheese and grill on the top shelf for about 5 minutes until the cheese is golden.