Combine peas, beans, broth, onion, ginger, salt, tumeric and fenugreek. Simmer for 45 minutes. Remove from heat. Saute garlic in butter for 1 minute. Add cumin, cayenne, coriander and garam masala. Saute for 1 minute. Add this to the lentil mixture. Serve over rice, sprinkled with lemon juice.