Preheat Oven to 375*
Cut the onion in half and slice lengthwise from pole-to-pole
Clean and thoroughly dry the potatoes
Put the veggies above in a bowl and toss with 2 tbs best quality olive oil
In a saute pan over med-high heat, brown the sausage until cooked through. Drain onto a paper towel removing all but 1 tbs fat
Mix sausage and pork fat with the vegetables and mix
Place entire contents in on a sheet pan (covered with Parchment paper for easy clean up).
Cook until vegetables are lightly brown and tender and potatoes are cooked through. About 25 mins