Stir together sugar, flour, baking powder, and salt. Set aside. In a separate bowl, whisk milk and lemon juice until it “curdles". This takes about 2 minutes. Add orange extract, poppy seeds, and apricot slices. Add wet ingredients to dry ingredients and stir together. Next, place the dough on a baking sheet fitted with plastic wrap and form into a circle. Cut into 8 wedges, seal with the plastic wrap and freeze for 4 hours or overnight. To bake: Preheat oven to 350F and place frozen scones on greased baking sheet. Brush with egg wash and sprinkle with orange zest and poppy seeds. Bake for 20-25 minutes until golden brown. To make glaze: Stir together powdered sugar, milk, vanilla, and orange zest. Glaze scones and serve! You can always serve glaze on the side as well.