These are the things u will need, if possible, sun them before u start, if not, just make sure they are completely dry.
When everything done, cover with plastic wrap and rubber band to prevent fruit flies and ants.
Strawberry - 500g
Lemon - 2
Rock sugar - about 400g (1 pack).
Note: the amount of rock sugar used, varies according to each taste, if u prefer sweeter, u can add more, after 3-4 days, u may want to open and taste it, to see if the sweetest is acceptable,
if too sour, then u can add more rock sugar;
if too sweet, then buy more strawberry to add.
GOOD LUCK!