Preheat oven to 400*F.
Position an oven rack in the upper third of the oven.
Remove the innards from the chicken and pat the chicken dry with a cloth.. Place breast side down in a medium roasting pan.
Pour the lemon juice all over the chicken, both inside and out.
In a small bowl, combine butter, oregano and onion powder.
Spread mixture all over the chicken, including the cavity.
Season all over with salt and pepper, including the cavity.
Prick 2 whole lemons three times each in three different places with a fork and place them deep in the chicken.
Put the chicken in the oven, lower the oven temperature to 350*F, and roast, uncovered, for 15 minutes.
Remove the roasting pan from the oven.
Turn the chicken breast side up.
eturn the chicken to the oven for about 1 hour to 1 hour and 15 minutes. R
Remove from the oven and let the chicken sit for 10 minutes before carving. Pour the juices from the roasting pan on top of the sliced chicken.
serve.