I use the three day rule. Try a new food three days in a row to see if there are any allergenic effects. I also use organic where I can. The first day I gave Mason cut up strawberries. He chewed on it briefly but didn't seem too impressed. Day two I pureed blackberries and strawberries with vanilla whole yogurt in a food processor.
The previous night I made cornbread to go with some turkey chili, so I spread this yummy paste on the leftover cornbread. I also gave him some with butter on a couple other pieces for variety. Butter is good for babies. They actually need the saturated fats for their growing bodies. We, on the other hand, should stay away from saturated fats.
The result: success! Mason gobbled up the cornbread slices. Later I found him standing in the fridge grabbing the blackberries and strawberries out for an afternoon snack. Tomorrow, day three, I will use the left over puree on either toast or just spoon feed the thick, yummy mixture to him. Or, just feed him cut up strawberries since now he seems to love them almost as much as blueberries.