Boil pasta in a 2 quart pot until tender, approximately 12 minutes.
Meanwhile, for sauce, lightly saut garlic in olive oil. Add tahina and broth, stir until tahina is dissolved. Add herbs, olives, and tomatoes. Continue stirring until sauce thickens.
When pasta is done, drain well, and transfer to large serving bowl. Add sauce and season with salt and pepper to taste. Stir thoroughly to coat pasta with sauce.