1. Use frozen rhubarb thawed and well drained to avoid excess liquid. Swap in up to 1 cup sliced strawberries and reduce rhubarb to 3 cups for a strawberry rhubarb version. No buttermilk available use 1 cup milk mixed with 1 tbsp lemon juice and rest 5 minutes. This recipe is a normalized best-fit version based on common rhubarb cobbler cake methods and may need small timing adjustments by oven and pan type