For the pretzels, dissolve the yeast in 1 1/4 cup warm water and let sit for a few minutes.
Combine flour, powdered sugar and salt in a large mixing bowl. Add the yeast mixture and the oil. Stir until the dough comes together and then turn out onto a lightly floured surface. Knead for at least 5 minutes until smooth and elastic. Place dough in a lightly oiled bowl, cover, and set in a warm place for about 45 minutes, or until dough has doubled in size.
Preheat oven to 425 and spray a baking sheet with non-stick spray.
Make the bath for the pretzels by combining the baking soda and 2 cups warm water. Stir until mostly dissolved.
Take dollops of dough and roll them into balls. They won't actually stay in perfect balls; they just need to be sort of rounded on top to make a bun. I made mine about 2 diameters and got about 40 out of the dough. Dip each ball into the baking soda bath, then blot on a paper towel just for a second to get rid of the drips. Place 12 on a sheet and sprinkle with the kosher or pretzel salt. Bake for 4 minutes, spin the pan around and bake for another 3-4 minutes or until golden brown. If desired, brush with melted butter.
When cooled, slice each roll in half to make the bun.
To make the mustard sauce, combine the dijon mustard, mayo, yellow mustard, horseradish, worchestershire, pepper and vinegar. Taste sauce and alter to your preferences.
Assemble sandwiches with sauce, roast beef, and caramelized onions. Buns can be made ahead of time and stored in an air-tight container. Once the sauce is on the bun, the soggy factor will kick in if stored, so only assemble what you plan to eat.

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Nutrition Facts

Per Serving Per 100 g

Amount Per 1 Serving
Calories	2687.82 Kcal (11253 kJ)
Calories from fat	1533.76 Kcal
		% Daily Value*
Total Fat	170.42g	262%
Cholesterol	234.05mg	78%
Sodium	5463mg	228%
Potassium	972.04mg	21%
Total Carbs	290.89g	97%
Sugars	198.46g	794%
Dietary Fiber	10.48g	42%
Protein	50.17g	100%
Vitamin C	10.5mg	17%
Vitamin A	3.1mg	102%
Iron	1.9mg	11%
Calcium	951.8mg	95%

Amount Per 100 g
Calories	634.12 Kcal (2655 kJ)
Calories from fat	361.85 Kcal
		% Daily Value*
Total Fat	40.21g	262%
Cholesterol	55.22mg	78%
Sodium	1288.85mg	228%
Potassium	229.33mg	21%
Total Carbs	68.63g	97%
Sugars	46.82g	794%
Dietary Fiber	2.47g	42%
Protein	11.84g	100%
Vitamin C	2.5mg	17%
Vitamin A	0.7mg	102%
Iron	0.4mg	11%
Calcium	224.6mg	95%

* Percent Daily Values are based on a 2000 calorie diet. Your daily values may be higher or lower depending on your calorie needs.
Find out how many calories should you eat.

Tastes

salty
savory
bitter
sweet

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