Heart-shaped blueberry cake

There is a legend in my homeland that, long ago, the mountain people, who depended on the mountains for their livelihood, came together in autumn to gather wild fruit, walnuts, pears, pine towers, mushrooms, etc. Trees are abundant in the mountains, and there are often wild objects, and people need to separate their harvests and not be too far away, so they have to take a few steps to greet each other and prevent them from falling apart. One day, a man came across a bush full of blue and purple fruit, and took a taste of it, and it was juicy, and it had a strange fragrance, and I didn't know what to call it, and he yelled at everyone, "All of it, all of it, all of it, all of it..." and then gradually evolved and called it today's name: Tomato. Blueberries are the name of imported or artificially grown berries, while in our small-hingy-pine areas the pure wild name is Tomato. This blueberries, which are grown in the primary forests north of the country's booming pine ridge, are known as "tomatos" and are grown in the north-east against the cold of less than 50°C. The roots are grown in frozen soil for years, and their fruits are rich in nutrients. Wild blueberries are extremely valuable and rare rare wild fruit. The blue purple fruit is mysterious, noble and radiant. I made blueberries from my hometown into blueberry jam, used in a cake. I didn't know it was a good taste