Psyllium husks powder
This soluble fiber comes from the shell of a seed which has multiple health benefits (it is a prebiotic, reduces cholesterol and blood sugar levels, helps preventing constipation...) and cooking uses due to its properties, as it works as a natural thickener and provides eslasticity and fluffiness to your recipes. Thanks to that, it is a great substitute for gluten while baking, as well as to make vegetarian meat alternatives.