The picturesque banks of Philadelphia’s Schuylkill River teemed with the sights and sounds of a delicious feast. A group of men were busy performing their various assigned culinary tasks. In a huge cast iron pan, over a lively wood fire, several freshly caught perch were frying in fragrant butter. Plump beefsteaks sizzled on a nearby gridiron. Sweet-spicy pork was slowly roasting over an open fire. And on a table nearby, ingredients were being assembled for the evening’s pièce de résistance, a potent concoction they called Fish House punch: Aged mellow rum, cognac, pure spring water, fresh lemons, sugar and peach brandy. 
 
This day of feasting first took place in 1732, the inaugural year of the select “Colony in Schuylkill” club, the oldest social organization speaking the English language (apparently earlier London clubs were not formally organized). This exclusive men’s group was founded as a men’s fishing club by a few of the original Philadelphia settlers, many of whom immigrated with William Penn to the New World.

The small group's intent was to “spend an idyllic day every now and then dawdling on the banks of the Schuylkill River … shooting game birds and fishing and cooking their catch for dinner, with no wives or servants present.” Their first meeting house, which they called “the castle,” was built on the west side of the Schuylkill River when the area was still a wilderness. In 1781 the group was renamed the “State in Schuylkill” and for generations they fished in the city’s streams, then cooked and ate what they caught themselves, each one serving the other.
 
Also referred to as the “Schuylkill Fishing Company” or “Fish House Club,” members have always prepared their own food, and in the beginning devoted much time to hunting and fishing, enjoying the time spent outdoors and sticking to simple cooking techniques. For example, club rules stipulate that “high seasoning” should not be used when grilling steaks. Although city development, pollution, and overfishing have caused the club to move its location several times over the years, the citizens (as club members are called) still gather along the Schuylkill to feast on barbecued pork, grilled steaks, planked shad, and perch “thrown” in skillets, all prepared by club members and served with the group’s famous Fish House Punch, a potent rum-based brew.
 
Fish House Punch
 

SERVES 1

Crushed ice

• 1 tablespoon lemon juice
• 1 tablespoon sugar
• 1 1/2 ounces brandy
• 1 ounce light rum
• 1 ounce peach brandy
• Lemon slice for garnish

Fill a cocktail shaker halfway with crushed ice. Add the lemon juice, sugar, brandy, rum, and peach brandy. Shake well to mix ingredients, then strain into a stemless wine or cocktail glass. Garnish with a slice of lemon.

Source: The Gilded Age Cookbook 

To serve a crowd ~ 

• 2 cups lemon juice
• 6 oz. superfine granulated sugar
• 2 bottles Jamaican rum (750 ml each)
• 1 bottle brandy or cognac (750 ml)
• 1 cup peach brandy or ½ cup peach liqueur
• 8 oz club soda, chilled

1. One day in advance, combine sugar and lemon juice in a bowl. Stir until sugar is dissolved.
2. In a container with a lid, combine the sugar-lemon mixture, rum, brandy and peach brandy. Stir, cover and refrigerate.
3. When ready to serve, fill a punch bowl with ice, add club soda and stir gently. 

Enjoy with caution – this stuff is potent!
Some recipes include sliced frozen peaches, which is a lovely addition 

Source: The Complete Bartender by Robyn M. Feller

 
For further reading about Philadelphia’s early food scene, check out Mrs. Goodfellow: The Story of America’s First Cooking School.