Preheat the oven to 350℉ (180℃)
Sift the flour into a large bowl and mix it with the baking powder and salt; set the bowl aside. Put the butter and eggs into a large bowl and beat them with a hand mixer until the butter is whipped and fluffy, about 2 minutes. (Alternatively, you can mix the ingredients together in a stand mixer, using a paddle attachment.) Add the milk, vanilla, lemon zest, and lemon juice, and beat until well mixed.
Add about 1/3 of the flour mixture to the mixing bowl and beat it into the wet ingredients until just incorporated; scrape down the sides of the mixing bowl with a rubber spatula, then repeat the process two more times to use all of the remaining flour mixture. Slowly pour the honey into the batter, and gently mix and fold it in until it is thoroughly incorporated.
Using a paper towel, spread the oil into an 8-inch (20 cm) round cake pan, making sure to cover the bottom and sides well. Pour the batter into the pan and bake until a tester inserted into the center of the cake comes out clean, about 45 minutes.
When the cake is done, let it cool in the pan for 15 minutes, then flip it onto a cooling rack, and let it continue cooling upside down. (Using the bottom of the cake as the top will give it a nice, flat surface.)
While the cake is cooling, make the glaze (see recipe below). With the cake still on the baking rack, gently pour the glaze onto it, so that it sits on top of the cake and drips naturally over the sides, then transfer the cake to a serving plate.
Crush the bee pollen with a mortar and pestle until it becomes a fine powder, and scatter big pinches of it onto the glaze. Arrange the sage blossoms or other edible flowers around the edges of the cake.