Member Antoine shared his recipe for sugar blocks. Enjoy!
4 cups water warm
10 teaspoons apple cider vinegar
10 pounds sugar
In large pot, bring to boil, use a candy thermometer, boil for 20 to 24 min just until temp is 125 celsius, about 257 f.
Remove from stove, add 10 drops each of lemongrass and spearmint oil
Pour into 2 wax paper lined trays