Heat a small skillet over medium-high heat. Add the coriander seeds and toast until fragrant, swirling the seeds occasionally so they toast evenly, 30 to 45 seconds. Transfer to a mortar and pestle or spice grinder and grind to a coarse powder.
Put the ground coriander in a medium bowl and add the eggs, mayonnaise, garlic, chile, chives, capers, salt, pepper, and hot sauce (if using). M