Preheat the oven to 400°F (200°C).
In a large oven-safe skillet or baking dish, sauté the garlic in olive oil until fragrant.
Add the orzo, coconut milk, and broth, and bring to a simmer.
Stir in the cherry tomatoes and peas.
Nestle the salmon fillets on top, and season with salt, pepper, and a squeeze of lemon juice.
Bake until the orzo is tender and the salmon is cooked through, adding a splash of warm broth if the orzo looks dry.
Stir in the spinach and Parmesan cheese until the spinach wilts.
Let the salmon rest for 2-3 minutes, then garnish with lemon slices and serve.