We eventually, actually, tried stepping on the lemons to get juice out - this worked for the kids who did not what to get sticky! And in all humility, the process we went through and figuring things out is such a great exercise for the children - it mirrors many real-life processes involved in science and everyday scenarios where people have to solve a problem.
Then came the mixing and tasting . . .
and making it pink!
We still really love snack time!