From Alton Brown's Pantry Raid series

https://www.youtube.com/watch?v=IKnTtTyuFts

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• 4 lg Onions (~3.5 lbs), sliced thin
• 1/4 + pinch Baking Soda
• 1 TBSP Kosher Salt
• 1 TBSP Brown Sugar
  • Combine in pot, mix, cover, let rest 10 minutes
• 1/4 cup olive oil
  • Saute over high heat until reduced by 75%, stirring often, and have turned a light gold
  • Reduce heat to medium, stirring for 15 minutes, until medium brown and bits stuck on bottom
• 1 TBSP Vinegar (amount?) (Sherry, Balsamic?)
• 1/4 cup Water (amount?)
  • Deglaze with some vinegar and water
  • Reduce heat to low, stirring until reduced to under a pint, and a dark golden brown
• 1 TBSP Vinegar (amount?)
  • Deglaze, stir a bit, remove. Should have about 1.5 cups

• 1/2 cup onions
• 1.5 cups sour cream
• 3/4 cups mayonnaise
• 1/4 tsp garlic powder
• 1/4 tsp white pepper
  • Mix to combine.
  • Better the next day