Season game hens inside and out with salt and pepper. In small saucepan, cook onion and rice in butter for 5-10 mins, stirring frequently. Add water, bouillon cube, lemon juice, and salt. Bring mixture to boiling, stirring to dissolve bouillon cube. Reduce heat, cover and cook slowly about 20-25 mins or until liquid is absorbed and rice is fluffy. Stir in drained mushrooms.

Lightly stuff birds with rice mixture. Place breast side up on rack in shallow baking pan. Brush with melted butter. Roast covered in 400 degree oven for 30 mins. Uncover and roast 1 hour longer or until drumstick can be twisted easily in socket. Brush birds with melted butter during last 15 mins of roasting time.