Heirloom Tomato and Cheese Tart - Chew Nibble Nosh

Ingredients

• For the Biscuit Dough:
• 1 3/4 cups all-purpose flour, plus a little more for dusting
• 2 tsp. baking powder
• 1 tsp. sugar
• 1/2 tsp. baking soda
• 1/2 tsp. table salt
• 6 Tbsp. cold, unsalted butter, cut into 1/2-inch pieces
• 3/4 cup cold, well shaken buttermilk (I used low-fat)
• For the Filling:
• 1/4 cup semolina or spelt flour
• 3-4 medium ripe tomatoes (about 1 1/2 lbs.), cored and sliced crosswise, 1/4-inch thick
• 2 oz. coarsely grated Gruyère cheese (about 2/3 cup, using the large holes of a box grater)
• 1/3 cup mayonnaise
• 1/4 cup finely chopped basil
• 1 tsp. finely chopped fresh oregano
• salt and pepper