Spiced Tomato Upside-down Cake

Ingredients

• 4 tablespoons butter
• 4 tablespoons brown sugar
• 2 teaspoons fresh grated ginger
• 2 small ripe red or yellow tomatoes, peeled, seeded and thinly sliced
• 1 1/2 cups flour
• 2 teaspoons baking powder
• large pinch salt
• 1 teaspoon ground ginger
• 1/2 teaspoon ground cloves
• 1/4 teaspoon ground cinnamon
• 1/4 teaspoon ground mace
• 1/2 cup butter
• 3/4 cup sugar
• 1/2 cup molasses
• 2 eggs, separated
• 1 teaspoon plus a few drops vanilla
• 1/2 cup milk
• 1 cup heavy cream
• 1 tablespoon confectioner's sugar