Steps: |
| -Heat the oil in a deep saute pan over medium heat, add the onion and salt and pepper. |
| -Reduce the heat to medium-low and cook until the onions are soft but nor brown, about 30 minutes, stirring occasionally. |
| -Add the stock and vinegar and simmer until the onions are golden and the pan is dry, about 30 minutes more. |
| -Add the thyme leaves and mix well. |
| -Serve warm or at room temperature. |
| -Refrigerate up to 1 week with a drizzle of oil over the top. |
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