I had tahini mushrooms on pumpernickel bread - was delicious. Much less faff than it sounds.
fry mushrooms, while those are on mix 1 tbsp tahini, 0.5 tsp stock/bouillon powder, 3 tbsp boiling water and toast whatever bread you use.
when mushrooms done, stir in tahini mix, bubble for 30secs or so till thickened and put on toast.
its a Patrick Holford low GI recipe