Steam the sweet potatoes until soft. You can also use leftover steamed or roasted sweet potatoes.

Finely chop the onion and spam.

Heat olive oil in a pan and sauté minced garlic for a few seconds.

Add the chopped onion and spam to the pan, sauté until cooked, then mix in ketchup to create the sauce.

Mash the steamed sweet potatoes in a bowl using a masher.

Mix the mashed sweet potatoes with milk and honey to create a sweet potato mousse.

Spread the sweet potato mousse into a gratin dish and layer the sauce on top.