This French style sandwich is one of the best ways to fill up without weighing down on your meat-free days: toasted baguette with grainy Dijon mustard, tender roasted asparagus, hard-boiled eggs, olive-oil packed tuna, fresh dill, coarse salt and cracked black pepper. Serve with a nice glass of wine and you have a feast! It can be prepared and refrigerated for up to 24 hours before serving.Inspired by and with thanks to TheKitchn