Rhubarb mustard salsa (for grilled fish)

•  1 tsp olive oil
• ½ lb rhubarb
• ½ c sugar
• 1½ T Dijon mustard
• ½ small red onion, chopped
• ¼ tsp lime juice
• 1 T chopped fresh parsley
• 1 tsp chopped fresh basil
• salt, freshly ground black pepper.

Heat oil in skillet over medium heat; add rhubarb and sugar, cook, stirring often, until rhubarb is soft, about 5 minutes. Remove from heat and stir in remaining ingredients.