I made strawberry jam this morning. I also made a mess, but that's par for the course with me. The strawberries came from BJs and were very beautiful--totally red. (They were also the cheapest ones I've found so far.) If you want sweeter strawberries, you don't want any white on the tips. They should be red all over. White on the tips means they were picked too soon and not allowed time to ripen!
Not sure why, but the strawberries are floating on the top. No matter, it still tastes flipping good.