Crumb cake, alternately known in some circles merely as “coffee cake,” is understandably popular around teatime, with a pinch of spice, a good bit of sugar, and that irresistible topping. Aficionados can agree that the crumb topping is the best part, which is why this rendition doubles down on the buttery streusel for a particularly generous helping. While alone this would secure its place next to a steaming hot cuppa, the ribbon of juicy fresh plums through the center seals the deal. If plums don’t make the cut in your fruit basket, try another fruit, or a combination, such as peaches, apples, or pears. No matter what you tuck into the center, the outcome will still be plum good.