Conserve

Merriam-Webster Online Dictionary
conserve (verb)
transitive verb
1.
to keep in a safe or sound state - he conserved his inheritance , especially to avoid wasteful or destructive use of - conserve natural resources
2.
to preserve with sugar
3.
to maintain (a quantity) during a process of chemical, physical, or evolutionary change - constant conserved DNA sequences
conserve (noun)
1.
- sweetmeat , especially a candied fruit
2.
- preserve , specifically one prepared from a mixture of fruits