Courgette - best wishes for your endeavor!
As for the hamburger, I believe you call "minced beef", or ground beef what we call hamburger, not to be confused with an actual hamburger sandwhich.
The onion and sage dressing sounds good as those are two of the key ingredients to most stuffing/dressing recipies. Here is a recipe for traditional southern cornbread dressing which is always the best!
several stalks of celery
1 good size onion
1 bunch of green onions
1 pan biscuits (not cookies!)
1 pan cornbread (are there mixes available there/)
6 eggs, well beaten
About 3-4 c. broth (make sure it is not dry)
2 tbsp. poultry seasoning
2-3 tbsp. sage (to taste)
4 boiled and chopped eggs
Mix all together and make sure it is not dry, if it is, pour a little more broth over dressing and bake. Always taste dressing before putting it in the baking pan to make sure about the taste. Bake at 425 degrees until lightly brown.
You can double the recipe and stuff some in the bird, and bake the rest in a pan.