How do I grind coffee for cold brew without a grinder?

When you find yourself without a dedicated coffee grinder, you are not necessarily out of luck. Cold brew is actually the most forgiving brewing method for manual grinding because it relies on a long, slow immersion process rather than the precise, uniform particle size required for espresso. Because the coffee steeps for 12 to 24 hours, minor inconsistencies in your grind size will not ruin the final cup.

For the best results, a mortar and pestle is your most reliable tool. It allows you to crush the beans manually, giving you visual control over the coarseness. Aim for a texture similar to sea salt or coarse peppercorns. This method is labor-intensive but produces the most uniform results among non-grinder options, as it avoids the heat and uneven chopping associated with high-speed blades.

If you prefer a faster approach, a standard kitchen blender or food processor can work, provided you use the 'pulse' technique. Never run the blender continuously, as the high-speed blades generate heat that can prematurely release the coffee's natural oils, leading to a harsh or bitter flavor. Use short, 3-second bursts and shake the container between pulses to ensure the larger pieces at the top fall toward the blades.

Alternatively, you can place your coffee beans inside a sturdy, sealable plastic bag and use a rolling pin or a meat tenderizer to crush them. This is a great way to avoid the mess of flying grounds. Simply roll over the beans with firm pressure until you reach the desired coarse consistency. While these kitchen hacks require more effort than an electric burr grinder, they are perfectly capable of producing a delicious, fresh-tasting cold brew.

In practice, remember that the goal is to avoid turning your beans into a fine powder, which would make your cold brew muddy and difficult to filter. If you are ever in a pinch, these manual methods ensure you can still enjoy your coffee without needing specialized equipment.