Preheat the oven to 350°F (180°C). Also, grease an 8x4-inch loaf pan. As further anti-sticking insurance, line the bottom of the pan with a cut-out piece of baking parchment.
Put the granulated sugar and lemon zest in a large bowl. Using your impeccably clean fingers, rub the sugar and zest together until fragrant -- about 30 seconds. One ingredient at a time, whisk in the yogurt, eggs, extracts, jam, oil, and self-rising flour.
Tip the batter into the prepared loaf pan. Bake until the batter puffs and a skewer inserted into the center of the cake comes out clean -- 45 minutes to 1 hour.
Allow the cake to cool in the pan for 15 minutes, then unmold it onto a wire rack to cool completely.
To make the lemon glaze, simply tip the sifted confectioners' sugar into a medium bowl. Add the juice from the lemon and whisk until smooth and pourable. If too thick, add more lemon juice or water; if too thin, add more confectioners' sugar. Pour the glaze over the cake, allowing it to drip over the sides.
Decorate, if desired, with the lavender blossoms and rose petals. Enjoy!