Heat 1 1/2 tablespoons of olive oil in a saucepan over medium heat. Stir in the orzo pasta; cook and stir until the orzo has lightly browned, 3 to 4 minutes. Stir in the onion, and cook until the onion begins to soften, about 3 minutes. Add 1 clove of garlic; cook until fragrant, about 30 seconds. Pour in the vegetable broth, and bring to a boil over high heat. Reduce heat to medium-low, and cover; simmer until the orzo is tender yet still a little firm to the bite, 12 to 14 minutes.