Ingredients
- 2 Tbsp. unsalted butter
- 2 Tbsp. olive oil
- 4 medium red onions, thinly sliced (7 cups)
- 1 tsp. fine salt
- 1 tsp. sugar
- 1⁄2 tsp. freshly ground black pepper
- 2 whole cloves
- 6 rhubarb stalks, cut into 1⁄4-in. pieces (4 1⁄2 cups)
- 1 Tbsp. finely grated lemon zest
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