Place grapes in large kettle; cover with water.
Cook until grape skins pop.
Pour into colander over pan; drain for 30 minutes.
Place colander over another pan; mash pulp and remaining juice into pan.
Mea- sure 4 cups pulp; combine pulp, sugar and lemon juice in kettle.
Place pulp, sugar and lemon juice in kettle or saucepan.
Cook, stirring constantly, for 30 minutes or until thickened.
Pour into hot sterilized jars; seal with paraffin.