Oma's Rhubarb Cake

INGREDIENTS

• 1 1/4 cups white sugar
• 1 teaspoon baking soda
• 1/2 teaspoon salt
• 2 cups all-purpose flour
• 2 eggs, beaten
• 1 cup sour cream
• 3 cups diced rhubarb
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• 1 cup white sugar
• 1/4 cup butter, softened
• 1/4 cup all-purpose flour
• ground cinnamon, for dusting