Swaps: Use cherry or Roma tomatoes in place of heirlooms (seed cherries so the toast stays crisp). Add torn mozzarella or a spoonful of burrata for a heartier bite. Vegan: skip the cheese add-ins. Make-ahead & storage: The topping keeps, covered, in the fridge 1-2 days and deepens in flavor. Toast the bread and prep the topping ahead, but assemble just before serving so the bread stays crisp. Freezing is not recommended.