Lithuanian Rhubarb Cake

Preheat the oven to 350°F (175°C).

Cream together butter and sugar in a large bowl until light and fluffy, about 2-3 minutes.

In a separate bowl, whisk together flour and soda.

Fold the dry ingredients into the creamed butter and sugar mixture until just combined into a thick batter.

Spread the batter into a greased 8-inch (20 cm) round or square cake pan, smoothing the top with a spatula.

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

Remove from the oven and allow to cool in the pan for 5 minutes before turning out onto a wire rack to cool completely.