Step 1 Preheat oven to 400°. Put a medium sized pot of water on to boil.
Step 2 Rinse tomatoes, mince garlic cloves, chop onion (if using), and transfer all to an oven-safe casserole dish. Pour olive oil over ingredients, and stir well to coat tomatoes.
Step 3 Add feta block to the center of dish, and sprinkle generously with dried parsley and chili flakes.
Step 4 Bake for 25-30 minutes, until tomatoes are blistered, and falling apart to the touch ( press down gently with a fork to test - take extra care not to splash piping hot tomato juice!). Keep warm in the oven until pasta is ready.
Step 5 Cook pasta according to package instructions, about 6-8 minutes. Strain, and pour hot pasta directly into casserole dish on stovetop.
Step 6 Stir pasta well, spreading the baked feta and tomato mixture throughout the Linguine to evenly coat.
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