In a small saucepan, bring sugar, ¼ cup (60 grams) water, and orange zest and sections to a boil over medium-high heat. Let boil for 5 minutes. Reduce heat to low, and simmer for 5 minutes. Remove from heat, and let cool. Strain mixture through a fine-mesh sieve, discarding solids. Cover and refrigerate for up to 2 weeks.
Recipe by Bake from Scratch at https://staging.bakefromscratch.com/blood-orange-loaf-cake/