Writer's Block

The elderly couple sat on the park bench, eating their sandwiches and throwing crusts at the pigeons.
"You know something, Betsy," began Donald, "this is the best sandwich I've had in years. It's not particularly nice, but it tastes different, and that ain't so common when you get to our age".
"I know just what you mean, dear. And yet, doesn't it taste somehow familiar?" said Betsy, catching a pigeon in the eye with her last throw.
"Not to me...but I'd like to know what it is. 'Meat paste' sandwich is a little vague".
"Ok, hold on while I finish mine".
A few minutes and two more dazed pigeons later, they began their slow amble along the path towards the sandwich van.
It looked like any other sandwich van - slightly grimy-looking, with a blackboard for the menu and the look of being ready to drive off at the first sign of danger. The sign on the top said 'Sophie's Sarnies'.
They approached the van, and waited patiently for the owner to finish with a customer. Then they pounced.
"Er, miss, we bought one of your sandwiches before..." began Donald.
"...and we were wondering, well, what's in it?" continued Betsy.
"Yes, what's in the meat paste? It's very unusual..." - Donald again.
"...we were thinking maybe kangaroo or dog..." - Betsy again.
"...or even squirrel? Please, tell us!" - Donald yet again.
Sophie finally managed to find a gap in the conversation and squeeze in.
"Listen, do you really want to know? It's not your usual kind of meat".
Donald and Betsy looked at each other.
"Yes!" they said in unison.
"We don't really care what animal it is, or how or where you got it, but we're curious nevertheless" explained Donald.
Sophie quickly checked to see if anyone else was around.
"Ok then. It's human meat".
Their eyes went wide.
"Specifically, lawyer".
They relaxed.
"Oh, that explains the bitter aftertaste!" said Betsy.
"Yes, and the slightly slimy texture" added Donald, "I don't suppose you have journalist or politician?".
"Not yet, I'm afraid. Come back in a couple of weeks and I should be able to sort you out"
"Will do. Well, see you"
They walked off. Sophie watched them for a moment, then looked at the blackboard menu. Then she shook her head. "No, that's a bit much, even for me..."