Start by preheating your oven to 425°F (220°C). A hot oven is crucial for achieving that beautiful caramelization on the vegetables.
While the oven is heating, wash and cut the cauliflower into small, uniform pieces. This ensures even cooking. Next, take your red bell pepper, remove the stem and seeds, and dice it into 1/2 inch pieces.
In a large mixing bowl, combine the cauliflower and red bell pepper. Drizzle with 2 tablespoons of olive oil and season generously with salt and freshly ground black pepper. Toss everything together until the vegetables are well-coated.
Transfer the seasoned vegetables onto a large baking sheet in a single layer. Make sure not to overcrowd the pan; this will help them roast evenly and attain that lovely golden color.
Place the baking sheet in the preheated oven and roast for about 20-25 minutes. Halfway through, give them a good stir to ensure even roasting. You’re looking for a golden-brown color and tender texture.
Once the cauliflower and red peppers are nearly done, remove the baking sheet from the oven. Sprinkle the pine nuts and sliced green olives over the top, then return it to the oven for an additional 5-7 minutes. This allows the pine nuts to toast lightly and the olives to warm up.
After roasting, take the baking sheet out and sprinkle the capers over the vegetables. If you’re using parsley, chop it finely and sprinkle it for a burst of color and freshness. Toss gently to combine.
For an extra zing, squeeze some fresh lemon juice over the roasted vegetables just before serving. This brightens up the dish beautifully.