Creamy Pancetta Dressing

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3 tablespoons olive oil

1 1/2 cups roughly cut pancetta

1 onion, finely chopped

1 clove garlic, minced

2 tablespoons minced fresh thyme leaves

1/4 cup cider vinegar

1 cup mayonnaise

1 cup sour cream

Freshly ground black pepper

3 heads iceberg lettuce, quartered and cleaned