Poached Oysters and Artichokes with Champagne Cream Recipe

Ingredients

• 2 tablespoons Champagne vinegar or white-wine vinegar
• 1 tablespoon olive oil
• 1 1/2 teaspoons salt
• 1 tablespoon all-purpose flour
• 4 medium artichokes (2 pounds total)
• 1 1/2 pounds spinach (2 bunches), stems discarded and leaves coarsely chopped
• 2 tablespoons minced shallot (1 small)
• 2 tablespoons unsalted butter
• 1/4 teaspoon salt, or to taste
• 1/8 teaspoon black pepper, or to taste for oysters and sauce
• 12 shucked large oysters such as Blue Point or Pacific, including liquor
• 1 cup Champagne or other sparkling white wine
• 1 tablespoon Champagne vinegar or white-wine vinegar
• 1/2 cup heavy cream
• 1/2 stick (1/4 cup) cold unsalted butter, cut into 4 pieces
• 2 tablespoons chopped fresh chives