Preheat your oven to 200°C / 400°F.
In a bowl, toss the broccoli florets with 4 tablespoon leftover Caesar dressing, using your hands if need be to ensure the broccoli is evenly coated.
Spread the broccoli on a baking sheet and roast for about 20 minutes. The broccoli should have some golden and crispy bits, but should still be a bit toothsome, not mushy.
While the broccoli is roasting, set a pot of water over high heat and bring it to the boil. Salt generously, then add the orzo. Cook for about 5-7 minutes, or according to package instructions, until orzo is al dente. Drain well, and transfer the orzo to the same bowl that the broccoli was tossed in previously.
Add the roasted broccoli and chopped almonds to the orzo, and toss to combine. Taste, and season with a bit more Caesar dressing if needed.
Serve hot, cold, or room temperature, garnished with slivers of Parmesan.