Multi seed Hallah buns or loaf,

5-5 1/2 cups bread flour
2 eggs lightly beaten
1 pkg active dry yeast or one cube fresh (always check date)
1 1/4 C warm water( about 110 degrees)
1 tsp salt
1/2 C sugar( 1/4 can be used for less sugar)
1/4 C oil
1 egg yolk
1 tbsp water

Multi seed mixture
1 tbsp sesame seeds
1tbsp poppy seed
1 tbsp Zahtar (can be omitted)
1 tbsp dried onion flakes
1 tbsp kosher salt
1tbsp flax seeds
Mix and keep aside till buns are ready.

In large bowl, dissolve yeast in warm water. Stir in salt, sugar, oil, eggs. Gradually beat in 5C  flour to make dough. Add the rest slowly as needed
Turn dough out into a floured board and knead until smooth add flour if necessary to prevent sticking. Place in a bowl very lightly oiled , turn to grease top. Cover and let rise in a warm place until doubled (about 1 1/2 hrs) Punch dough down, knead briefly on a lightly floured board.
Cut into equal parts, form ropes to make knot buns
Preheat oven at 350, beat together egg  yolk tablespoon of water, pinch salt, spread evenly over buns using soft brush, sprinkle with seed mixture
Bake for 30-35mn or until golden brown and sound hollow when tapped. Let cool on wire rack