A regular Summer activity for my family is to purchase fresh Italian sausage and cook it on the grill. It's eaten on as a sandwichon fresh Italian rolls with butter, lettuce, cucumber, onion and a simple dressing of mayo, cider vinegar, olive oil, and water.
Right now the best sausage we've found is at Borrelli's in Methuen. My favorite is the tomato and cheese, though we also like the sweet and hot varieties. It tastes like sausage my grandfather used to make, and is chock full of sharp provolone and high-quality pork.
Second in my book is Gene's in Milford. It's different and they don't have tomato and cheese (seems to be a Lawrence/Methuen area specialty) but Gene's seems extra meaty and toothsome, and has great flavor. It also shrinks less than other sausage I've bought - possibly lower in fat content?
So where do you get great sausage? How do you serve it?