Bring a pot of water to a rolling boil. Salt generously (water should taste like the ocean).Add orzo pasta and thyme stalks. Cook until pasta is ready to how you like it (I like to cook mine for a little longer than the package says to make the pasta softer!). While pasta is cooking, move a rack in your oven as low as it will go and turn the oven on to a high broil. Cut the baby tomatoes in half and spread them on a baking sheet. Toss them in the olive oil and sprinkle on garlic and salt, distributing evenly. Place on the bottom rack in the oven. WATCH THESE CLOSELY! You want them to look really shriveled and nicely roasted but NOT burnt!
Drain pasta and toss together with the margarine then add tomatoes. Don't throw away the thyme - strip the stalks and add it to the orzo. Depending on your taste, you may want to add more salt and pepper, if desired.