Ah, the great romaine price crisis of our time. It's enough to make you want to swear off salads forever. But fear not, your dinner can be saved from the tyranny of expensive leafy greens.
For a Caesar, you need a certain structural integrity, a green that won't immediately wilt into a sad, creamy puddle when the dressing hits. I'd suggest escarole or even radicchio mixed with a milder green. Escarole has a nice, sturdy texture and a slight bitterness that actually pairs wonderfully with a rich Caesar dressing. It's the kind of substitute that makes you wonder why you ever bothered with romaine in the first place.