Add 3 Tbs lemon juice and enough water to make 1 2/3 cups liquid in 2-cup measuring cup; pour into medium sauce pan and bring to a boil. Stir in quinoa, salt, and ginger and reduce heat to medium-low. Cover and simmer 20 minutes, or until all liquid is absorbed. Remove from heat, and stir in milk and lemon zest. Cover, and let stand 5 minutes.