It is not necessary to roast flax seeds before grinding them. Flax seeds can be ground without roasting, and they are commonly consumed in their raw, ground form to maximize their nutritional benefits. Grinding flax seeds helps break down their hard outer shell, making it easier for your body to absorb the nutrients they contain, such as omega-3 fatty acids and dietary fiber.
However, some people prefer to lightly toast flax seeds before grinding to enhance their flavor and add a subtle nutty taste to dishes. Roasting can also make the seeds more fragrant and appealing in certain recipes.
Whether you choose to grind flax seeds raw or roasted depends on your personal preference and the specific culinary application. Both methods are acceptable, and the choice depends on the flavor and texture you desire in your dishes.