Jefferson's had developed a taste for French Cuisine while he was a Minister to France. He brought back many household goods, including items for his kitchen. At Monticello he establish a very advanced kitchen for the times.
This is an eight position "stew stove". Each position could have the fire managed at the proper temperature for whatever was being cooked there.
This is a "spit jack". This was an automated mechanism for turning a roasting spit in the fireplace.
Jefferson was very interested in horticulture and planted a wide variety of trees, vegetables and ornamental plants.