How did the angel show a sign to gideon? the bible story

The answer to the question is in the 6th chapter of Judges. Hope this helps.

The angel of God said to him, 'Take the meat and the unleavened bread, place them on this rock, and pour out the broth.' And Gideon did so. Then the angel of the LORD touched the meat and the unleavened bread with the tip of the staff that was in his hand. Fire flared from the rock, consuming the meat 

dissolve it water and filter it through paper. The sand will be in the paper and then sugar will be dissolved in the water. you can let the water evaporate and you will have the sugar back.