Eggs Benedict with beef salami and mushrooms

Ingredients

• 95 ml (1 c. Tbsp + 1/3 cup) butter
• 100 g (3 1/2 oz) All beef Lesters Salami cut in cubes
• 1/2 of a 227 g container of button or cremini mushrooms, sliced
• 30 ml (2 Tbsp) dry white wine or vermouth
• 1 package instant hollandaise sauce (32 g)
• 160 ml (2/3 cups) cold water
• 1 litre (4 cups) water
• 15 ml (1 c. Tbsp) white vinegar
• 4 eggs at room temperature
• 2 Brioche style hamburger buns
• 125 ml (1/2 cup) Emmenthal cheese, grated
• Fresh basil leaves or other fresh green herb, for garnish (otpional)