Creamy Tuna Mushroom Pasta

Bahan-bahan (3 porsi)

• 8 ounces uncooked pasta (I used farfalle)
• 2 tablespoons butter
• 16 ounces sliced baby bella mushrooms
• 5 cloves garlic, pressed or minced
• 1 tablespoon finely-chopped fresh rosemary*
• 1/4 teaspoon crushed red pepper flakes
• 1/2 cup heavy whipping cream (optional*)
• 1/2 cup freshly-grated Parmesan cheese
• 1 small lemon, zested and juiced
• 2 large handfuls fresh baby spinach
• 2 (5-ounce) cans of canned tuna, drained
• fine sea salt and freshly-cracked black pepper