Hi, Karolinka,
I stumbled upon your blog while searching for a pumpkin jam recipe - I never thought I would come across a Bulgarian jam. Yes, it's called рач'ел (the stress falls on the e), and it's made with slacked lime which was used a lot by our grandmothers in making preserves from mushy fruit - pumpkin, figs (green), even strawberries. You might also have noticed that we have quite a few words for jam (depending on the sugar content), which are difficult to translate into English - at least for me... Best wishes,
Tsveti