Mix cottage cheese, sugar, butter, 1 teaspoon salt, and baking soda together in a large mixing bowl. Add dill seed, dried onion, egg, and yeast mixture. Mix well. Gradually add flour, about 1/4 cup at a time, stirring well after each addition. If dough seems too sticky, add another tablespoon or 2 of flour.
Cover bowl with a clean cotton kitchen towel and place in a warm place until double in size, about 1 hour.
Preheat oven to 350 degrees F (175 degrees C). Generously butter a 1 1/2- to 2-quart baking dish.
Gently stir dough to release bubbles. Transfer to prepared baking dish. Bake in preheated oven until golden brown, about 35 minutes. Remove from oven; brush top with butter and sprinkle on a pinch of salt. Let bread cool 5 minutes before transferring from the baking dish to a cooling rack.
