Don’t just dump a glug in and hope for the best. The ratio is key: use 1.5 ounces of cognac per 4 ounces of high-quality eggnog. This keeps the alcohol present but balanced, allowing the spices to shine.
Always stir, never shake. Shaking eggnog aerates it too much, turning it foamy. A gentle stir in a mixing glass with ice, then strain into a punch cup or tumbler—this maintains that velvety texture we love.
Add a garnish, even if it’s just a cinnamon stick. The visual cue signals “special occasion,” and the aroma activates your palate before you even take a sip.