Preheat your oven to 170 °C (340 °F). Line a 27 x 18 cm baking pan with baking paper.

In a large mixing bowl, whisk together the eggs and sugar until light and fluffy.

Add the sunflower oil and mix well.

In a separate bowl, combine the flour, baking powder, and cinnamon powder. Gradually add this mixture to the wet ingredients, stirring until just combined.

Fold in the walnuts, raisins, diced apples, and lemon juice until evenly distributed in the batter.

Pour the batter into the prepared baking pan and spread it evenly.

Bake in the preheated oven for 35-40 minutes, or until a toothpick inserted in the center comes out clean.

Allow the cake to cool in the pan for a few minutes before transferring it to a wire rack to cool completely.