What ingredient is often added to tempura batter for richness?

Egg yolk is often added to tempura batter for richness, color, and a fuller coating texture. Traditional batter commonly combines flour, cold water, and egg; recipes may use a whole egg, yolk only, or, less often, egg white alone.

The yolk contains fat and lecithin, an emulsifier that helps disperse fat and water through the batter. During frying, yolk proteins set and contribute to the coating’s structure, while the added fat gives the crust a richer flavor and a deeper golden color. Yolk-only batters are sometimes described as “golden tempura.”

This does not mean every authentic tempura recipe uses extra yolk. Many chefs prioritize an extremely light, pale coating and use a restrained amount of egg or omit it altogether. Cold ingredients and minimal mixing are also crucial because they limit gluten development and help preserve tempura’s delicate crispness.

Egg white has a different effect: its proteins can create a firmer, paler coating that may remain crisp longer. Butter and milk are not standard traditional tempura-batter ingredients.