Vietnamese Philly Cheesesteak

Ingredients

• 2 lbs striploin or ribeye steak, thinly sliced
• 2-3 shallots, minced
• 8-10 cloves garlic, minced
• 4-5 Tbsp soy sauce
• 2 Tbsp oyster sauce
• 1 Tbsp Red Boat fish sauce
• 2 Tbsp sugar
• 1 tsp bouillon (chicken or beef)
• Pinch of salt and freshly ground black pepper, to taste
• 2 white onions, thinly sliced into rings or half-moons
• 1 ½ tbsp unsalted butter
• Brioche hotdog buns or Italian rolls
• 1 green pepper, julienned
• Provolone cheese
• Regular or Kewpie mayo, for topping