Pierogies with Fixins'

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Dough:

2 cups all-purpose flour, plus more for dusting

1/2 cup milk

1/4 teaspoon salt

1 egg

Filling:

2 cloves garlic

2 russet potatoes, cubed

1/4 cup grated aged Cheddar

1/4 cup heavy cream

2 teaspoons red wine vinegar

1 teaspoon unsalted butter

1/2 teaspoon sea salt

2 green onions, thinly sliced

Freshly cracked pepper

2 tablespoons canola oil, plus more for cooking onions

1/2 cup sour cream

6 sweet gherkins, minced

1 small yellow onion, sliced 1/4-inch thick