In a saucepan, heat oil over medium. Add onion and cook until softened, 5 to 6 minutes.
Add rhubarb, raisins, sugar, ginger, and cinnamon stick. Cook over medium, stirring occasionally, until rhubarb begins to break down, 6 to 8 minutes. Remove cinnamon stick and stir in vinegar. (To store, refrigerate, up to 5 days.) Serve with ham or pork and cornichons.
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