Baked Roast Beef and Provolone "Tea" Sliders on Everything Buns

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1 1/2 sticks (12 tablespoons) butter, melted, plus additional for buttering baking dish

1 tablespoon poppy seeds 

1 tablespoon sesame seeds 

3/4 teaspoon dried minced garlic 

1/2 tablespoon dried minced onion 

Pretzel salt or kosher salt 

1 package Hawaiian sweet rolls

1 1/2 pounds shaved rare roast beef from the deli counter, preferably a premium brand like Boar's Head 

2 cups crispy French-fried onions 

1 pound sliced sharp provolone

1 cup spicy pickle rounds