Roast the pine nuts together with the sultanas in a non-stick pan for a few minutes.
In a small pot, warm the plum puree with 2 tablespoons of water, the olive oil and a little salt. Let cool and season with pepper.
Quarter and core the apples, cut into pieces and drizzle with the lemon juice. Mix with the spinach, sultanas, pine nuts and onions and pour the plum sauce over them.