I often use this Bitter / Sweet prayer station with both adults and children.
Here is how the prayer happens as a prayer station.
Place either a bowl of marshmallows or a bowl of honey and some crackers/bread sticks on a table.
Next to them place a bowl of lemon slices or sour sweets. In front place a sign as below.
This can also be led as a whole group prayer handing round the bowl of sweet things first and allowing time for prayer and then handing round the bowl of sour things.
With this prayer you do need to be aware of food allergies and have appropriate alternatives available.