essential oil–rich plant matter and seed oils, not standard biodiesel feedstocks like soybean or canola. That changes the approach significantly. Let’s go step by step. ⸻ 1. Citrus peels and herbs • What they contain: Mostly essential oils (like limonene, pinene), terpenes, and some minor fatty oils. • Conversion possibilities: • Essential oils extraction: Steam distillation or cold-pressing can capture volatile oils. These are fragrant and sometimes usable in solvents, cleaning products, or eve