Green-Tomato Jam

• MAKE-AHEAD
• VEGETARIAN

Ingredients

1. 1 1/2 pounds firm green tomatoes, cored and finely chopped
2. 2 cups sugar
3. 1/2 lemon, scrubbed and thickly sliced

1. Spread half of the tomatoes in a large saucepan. Cover with 2/3 cup of sugar, the lemon slices and another 2/3 cup of sugar. Spread the remaining half of the tomatoes and 2/3 cup of sugar on top. Let stand without stirring until most of the sugar has dissolved, about 1 hour.
2. Stir the tomatoes. Bring to a boil over moderate heat, stirring frequently. Reduce the heat to moderately low and cook, stirring occasionally, until the jam cooks down to 3 cups, about 1 hour. Let cool, then discard the lemon slices.