Combine sauce ingredients in a small saucepan. Heat to boiling lower to simmer and cook one minute. Place oven rack in lower third of oven and preheat to 375 degrees.
Rinse hens with cold water, dry well.
Season cavities with salt and pepper. Place half slice lemon in each, divide 1 Tablespoon espresso sauce between each cavity equally. Tie or skewer hens and roast breast side up in a shallow baking pan. Brush with a little sauce and cover loosely with a foil tent. Roast for 30 minutes, remove foil and brush with sauce.