own-made strawberry jam

Summer is the time where most fruits is harvest. Recently, I was caught on the TV program abt picking of yr own strawberries n making it into jam. It is pretty interesting n simple, u can make yr own liking of berries nt only strawberries.
Here is the recipe:

Ingredients
2 pounds strawberries (910g), rinsed, hulled, and cut into quarters. small berries into halves
4 cups white sugar
juice of 1 lemon

Directions
1.Place slightly crushed berries in a heavy bottom pot set over medium-high heat. Using a wooden spoon, mix in 1/4 cup sugar n lemon juice with berries. Cook, stirring, until berries are juicy, 5/ 6 mins. Stir in a third of remaining sugar until dissolved. Repeat until all the sugar has been added and dissolved abt 7mins.
2.Bring mixture to a full boil; stirring 10 mins n remove foam from surface. Continue boiling until most of the liquid is absorbed, mixture thickens, and temperature registers 220 degrees F (105 degree C); use a candy thermometer, about 30 mins.
3.Perform a gel test: Place a plate in the freezer. After 10mins of boiling jam, place a tsp of it on the cold plate. Return to freezer for a minute. gently press jam with fingertip; it should wrinkle slightly. If nt, let it boil for 1 min, n try again til yr liking of thickening.
4.After jam passes the gel test, remove from heat. To sterile the glass jars, boil them for 20mins. Pour warm jam into sterile jars, leaving 1/4 inch headspace, and seal, label, and refrigerate up to 4 months.
Use slightly underripe strawberries for best results. To extend the jam's shelf life, add mre sugar abt half of the fruits weight n let it soak into the berries abt 3hrs (while u having yr lunch). To add mre tasty favour, add a cup of yr fav tea into the boiling jam.