Prepare the nettles: Rinse nettles thoroughly under cold water. Bring a pot of salted water to a boil and blanch the nettles for 1–2 minutes until wilted. Drain and rinse under cold water.
Chop the nettles: Squeeze the blanched nettles to remove excess water, then chop them finely.
Mix the wet ingredients: In a large bowl, whisk together the eggs and milk until smooth.
Add the dry ingredients: Stir in the flour, salt, pepper, and spices, whisking until the batter is smooth.
Fold in the flavorings: Gently stir in the chopped onion, nettles, garlic, and shredded cheese until evenly combined.
Check the consistency: The batter should be thick but spoonable, like pancake batter. Add a little more flour if too thin, or a splash of milk if too thick.
Cook the fritters: Heat 2 tablespoons of coconut oil, tallow, or ghee in a heavy skillet over medium heat. Drop spoonfuls of batter into the pan and gently flatten. Fry 2–3 minutes per side until golden and crispy. Cook in small batches to avoid overcrowding.
Serve: Drain briefly on paper towels, then serve hot with sour cream, garlic sauce, or your favorite dip.