Step 1

Preheat oven to 375 degrees. Butter a 9-1/2 x 13-inch baking pan.

Step 2

Mix the flour, sugar, baking powder, salt and Xanthan gum (if you are using it) together in a medium bowl.

Step 3

Add the milk, peach syrup, and Grand Marier and mix lightly.

Step 4

Add the melted butter (slightly cooled) and mix until just incorporated.

Step 5

Pour batter into the buttered pan.

Step 6

Place the peaches evenly on top of the batter BUT DO NOT MIX THEM IN. Arrange the peach slices however you want but resist the urge to stir everything together. Sprinkle the lemon zest over peach slices.

Step 7

Bake until the batter rises slightly around the peaches and the crust is golden brown.

Step 8

You can use fresh peaches or frozen peaches if you wish. You will need approximately 2 cups. See below for tips on peeling fresh peaches.