Preheat oven to 325°. On a baking pan, place the tomatoes cut side up on a baking pan. Sprinkle with thyme, salt and pepper and drizzle with 1/4 cup olive oil. Roast the tomatoes until they begin to soften (about 20-25 minutes).
In a large pot of salted water, cook the linguine until it's al dente. Drain and transfer to a large bowl.
Cook the frozen spinach according to package instructions and add them to the bowl with the pasta. Season with salt and pepper.
Add the roasted tomatoes and a 1/4 olive oil. Serve the pasta topped with 1 tablespoon of ricotta.