Caramelized Onion & Asparagus Tart

Caramelized Onion & Asparagus Tart

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America's Heartland Recipes: Caramelized Onion & Asparagus Tart

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Cooking tools:

  • Rolling pin
  • Pastry brush
  • Pot
  • Oven
  • Stove
  • Baking sheet
  • Fork
  • Mixing bowl
  • Wooden spoon
  • Spoon
  • Spatula
  • Chef's knife
  • Grater

Ingredients

  • 2 tsp butter (or olive oil)
  • 3 large onions, cut lengthwise and sliced root to end
  • 1 tbsp sugar
  • 2 tbsp balsamic vinegar
  • 8 oz puff pastry
  • 1 egg
  • ¼—½ cups shredded gruyere
  • 8—10 asparagus stalks, washed and tough ends removed
  • Salt
  • Pepper

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