Preheat your oven to 175°C (350°F) and grease a 9-inch round cake pan with olive oil or butter.

In a medium bowl, whisk together ground almonds, all-purpose flour, baking powder, cinnamon, and salt. Set aside the dry mixture.

In a large mixing bowl, combine granulated sugar, eggs, olive oil, orange juice, orange zest, and vanilla extract. Whisk until smooth.

Gently fold the dry mixture into the wet ingredients until combined. Avoid overmixing.

Pour the batter into the prepared cake pan and bake for 30-35 minutes, until a toothpick comes out clean.

In a saucepan, combine sugar, water, cinnamon stick, and lemon juice. Simmer until sugar dissolves, then cool slightly.

After the cake has baked and cooled for 10 minutes, poke holes in the surface and pour the warm syrup over the top.

Allow the cake to cool completely in the pan before serving. Slice and enjoy with toppings if desired.