Tuna steaks au poivre with french onion sauce and garlic scapes

After a weekend at a bed and breakfast in New Hampshire where we learned how to make a true French onion soup, my fiancée and I stopped at a seafood shack nearby, where deliciously fresh tuna steaks were on offer. Tuna steak and French onion soup seem like unlikely mates, but I was in the mood for a classic sauce a poivre, and the rich savoriness of the soup seemed like it might just work as a replacement for the more conventional veal demi-glace base. A quick glance through our selections from this week's CSA box turned up some lovely garlic scapes — and here are the results!