Roast the onions and garlic

• Toss the sliced onions with olive oil, salt and pepper in a baking dish.
• Place the garlic head cut side up in the dish and cover with foil.
• Bake until the onions are deeply caramelized and the garlic is soft.

Cook the pasta

• Boil the pasta in salted water until al dente.
• Reserve a little cooking water and drain.

Build the sauce

• Squeeze the roasted garlic out of its skins into the caramelized onions.
• Add the lemon juice, then stir in the greens and coconut milk until the greens wilt.

Combine and serve

• Stir the pasta into the sauce, loosening with cooking water if needed.
• Serve straight away.