Let’s break down the process into easy-to-follow steps.

Step 1: Macerate Berries. Place the mixed berries in a large bowl. Mix 1/3 cup of the sugar, the orange zest, and the orange juice; toss gently with the berries. Refrigerate, covered, for 45 minutes. This allows the berries to release their juices and create a flavorful syrup.

Step 2: Make Mascarpone Cream. Beat the heavy cream until soft peaks form. In another bowl, mix the mascarpone cheese, vanilla extract, and the remaining 1 cup of sugar. Fold in the whipped cream, a third at a time, until just combined. Be careful not to overmix.

Step 3: Drain Berries. Drain the macerated berries over a shallow bowl, reserving the juices.

Step 4: Assemble Tiramisu. Dip the ladyfingers in the reserved berry juices, allowing any excess to drip off. Arrange the ladyfingers in a single layer on the bottom of a 13×9-inch dish.

Step 5: Layer Ingredients. Layer half of the drained berries over the ladyfingers. Top with half of the mascarpone cream, spreading it evenly.

Step 6: Repeat Layers. Repeat the layers: ladyfingers (dipped in juice), remaining berries, and remaining mascarpone cream.

Step 7: Chill. Refrigerate, covered, overnight. This allows the flavors to meld and the ladyfingers to soften.

Step 8: Serve. If desired, top with additional fresh berries before serving.

These are easy instructions.