Step 1Heat the oven to 325 degrees.
Step 2In a medium, heavy-bottom fry pan heated over medium heat, add the olive oil and onion. Gently cook until the onion caramelizes, about 20 minutes, stirring frequently. Stir in the sugar and continue to cook until the sugar dissolves. Stir in the cinnamon, ginger and thyme sprigs. Finally, stir in the chopped pumpkin.
Step 3Place the pumpkin mixture in a 13-by-9-inch baking dish. Bake the pumpkin until it is tender and slightly caramelized, 45 to 50 minutes, stirring every 15 minutes. Remove and discard the thyme sprigs.
Step 4While the pumpkin is baking, prepare the couscous according to the manufacturer's instructions.
Step 5To serve, mound the couscous in the center of a large platter and garnish with the pumpkin.