For cake:
2-1/2 cups gf flour*
1 teaspoon baking soda
1/2 teaspoon salt
4 Tablespoons unsalted butter
1/4 cup canola oil
1 cup gf brown sugar
1-1/2 cups white sugar
3-1/2 oz. gf semi-sweetened chocolate
3 large eggs
1/2 cup
creme fraiche or gf sour cream
2 teaspoons vanilla
1/2 cup boiling water
For frosting:
3 large egg whites
1 cup sugar
1/3 cup light corn syrup
Pinch of salt