Clean, wash and cut the rhubarb into pieces of about 2 cm. Wash, clean, sort and cut the strawberries into pieces. Wash orange hot, rub dry and thinly grate the skin. Halve orange, squeeze juice
Mix rhubarb, strawberries, sugar, orange peel and juice in a pot and put it in a cool place for about 1 hour (let it draw to juice). Bring to the boil while stirring, then let it boil fizzily for at least 4 minutes. Jam still hot in sterilized glasses
Waiting time approx. 1 hour