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["Lightly coat an 8 1/2x4 1/2"" loaf pan with nonstick spray and line with parchment paper, leaving a 2"" overhang on both of the long sides. Mix tahini, kosher salt, and 2 Tbsp. sesame seeds in a medium bowl to combine; set tahini mixture aside.", "Cook sugar and 1/2 cup water in a small saucepan over low heat, stirring with a heatproof rubber spatula, until sugar is dissolved, about 4 minutes. Increase heat to medium-high and fit pan with candy thermometer. Cook syrup, brushing down sides of saucepan with a wet pastry brush as needed to dissolve any crystals that form, until thermometer registers 250u00b0F, 7-10 minutes. Immediately remove syrup from heat and gradually stream into reserved tahini, mixing constantly with spatula. Continue to mix just until halva comes together in a smooth mass and starts to pull away from the sides of bowl (less than a minute). Be careful not to overmix or halva will be crumbly. Working quickly, scrape into prepared pan and let cool.", "Melt chocolate in a heatproof bowl set over a pan of simmering water (do not let bowl touch water), stirring often. Remove from heat. Invert halva onto a wire rack set inside a parchment-lined rimmed baking sheet; peel away and discard parchment. Pour chocolate over halva and sprinkle top with flowers (if using), sea salt, and remaining 2 Tbsp. sesame seeds. Let sit until chocolate is set before serving, about 30 minutes.", "Halva can be made 3 days ahead. Store tightly wrapped at room temperature."]
