Preheat the oven to 400 F. Get a casserole or 2 quart baking dish.
Pit the plums, leave them in halves and big pieces. Place in the baking pan as you go.
In a large bowl, combine the flour, sugar, oats, salt and cinnamon, and stir to mix. Stir in the melted "butter" and ginger. Sprinkle over the fruit in the pan.Bake for 30-40 minutes, until bubbly and golden brown. Let cool slightly before serving with "ice cream."