Clafoutis is one of the classic French desserts which you will never find in most cafés or dessert shops. Probably because it is so easily homemade that one is embarrassed to charge money for it. Okay, I was only half joking. Unless it is served in pretty single-portion baking dishes, charged at the same price point as crème brûlée, I really doubt it'd be feasible to put clafoutis on one's menu. And that's my half-assed amateurish deduction as to why it is rarely found when eating out.
Clafoutis is essentially a baked, firm batter with some fruit in it, the classic choice being fresh whole cherries. Talk to the French about cherry clafoutis and you will see the opposing sides of pitting or not pitting the cherries. The latter, some say, will add a subtle nutty flavour to the dessert. Ask my mother-in-law and she will shrug her shoulders and say that's how she does it because she doesn't have time to remove the stones, and besides, why spoil something that's not broken?