01 -
Peel and thinly slice sweet onions into uniform strips for even caramelization.
02 -
Melt butter with olive oil in a skillet over medium-low heat. Add onions and a pinch of salt, stirring occasionally for 30 to 40 minutes until onions are deeply golden and aromatic.
03 -
Stir in minced garlic and fresh thyme leaves with the caramelized onions. Cook for 1 to 2 minutes to release fragrance.
04 -
In a mixing bowl, combine sour cream and mayonnaise until smooth.
05 -
Fold cooled onion mixture into the cream base. Season with freshly ground black pepper and adjust salt as desired.