Hacker-Pschorr says:

As it was forbidden to brew in summer, a stronger beer -- the Märzen -- was brewed earlier in March. It would finally be served at the Oktoberfest, under the "Heaven of Bavaria." We have returned once again to the age-old recipe and recreated that gloriously smooth, honey-coloured piece of history from times gone by. Perfect with: Bavarian sausage salad and all the titbits a true Bavarian would also enjoy: roast chicken, sausages or suckling pig cooked in Wiesn beer.