The Difference Between Medium and Dark Roast Mandheling Coffee - Mandheling Coffee Roasting Tutorial

FrontStreet Coffee's Indonesia Golden Mandheling Roasting Experience

1. Medium-Dark Roast

Rich and mellow with more pronounced bitterness, enhanced chocolate notes and subtle sweetness, distinct licorice aroma, weak fruit acidity, moderate smoothness - intense aroma but less complexity.

2. Medium Roast

Excellent balance. At this roast level, Golden Mandheling loses some of its bold character but gains more elegance. The taste is purer than at medium-dark roast while maintaining good body. Smoothness is significantly better, bitterness remains prominent but noticeably weaker, and fruit acidity is clearly enhanced.

3. Medium-Light Roast

This roast level of Golden Mandheling presents quite a dilemma - you either love it or hate it. If medium-dark roast emphasizes bitterness, medium-light roast pushes fruit acidity to its peak tolerable level. The cup is smooth with distinct but comfortable fruit acidity, creating a mouth-watering sensation on both sides of the palate. Moreover, the bold character of Golden Mandheling has completely vanished, making it refreshingly delicate.

Roast Level Flavor Characteristics

Light roast beans mostly exhibit fruity-acid flavors from the enzymatic/Maillard group, such as lemon, coffee blossom, and apricot; medium roast beans primarily show caramel aromas from the caramelization group, like roasted almonds, hazelnuts, and roasted peanuts; dark roast beans display smoky aromas from the dry-distillation group, such as cedar, pepper, and clove.

Medium-dark roast beans approach the end of caramelization, dominated by the Maillard reaction, producing resinous, spicy, and carbonized aromas. FrontStreet Coffee's Golden Mandheling performs best at a medium-dark roast, featuring elegant woody notes, cedar and fir aromas, with turpentine-like flavors. The mouthfeel is smooth with a thick texture.

Roasting Process

Preheat to 200°C and set the damper to 3. After 1 minute, reduce the heat to 160°C, keeping the damper unchanged. At 5'40", the temperature reaches 148°C, the beans turn yellow, the grassy aroma completely disappears, and dehydration is complete. Reduce the heat to 140°C and adjust the damper to 4.

At 9'40", ugly wrinkles and black spots appear on the bean surface and the toast aroma clearly transforms into coffee aroma - this can be defined as the prelude to first crack. Listen carefully for the first crack. At 9'54", first crack begins; reduce the heat to 60% and fully open the damper (adjust the heat very carefully - not so low that cracking stops). Drop the beans at 204.5°C.

Flavor Characteristics

Golden Mandheling possesses high-quality herbal notes, stronger caramel sweetness, and a relatively calm, elegant fruit acidity. With rich sweetness, full body, and wild spice flavors, regular Linthong Mandheling is best roasted beyond second crack to effectively reduce off-flavors. Golden Mandheling, however, already exhibits excellent clarity and sweetness even before second crack, offering far broader interpretive space for roasting.

FrontStreet Coffee Recommendation

FrontStreet Coffee's PWN Golden Mandheling comes from Indonesia's PWN company, which applies exceptionally strict standards: a base of beans at screen size 18 and above, fewer than 3 defective beans per 300g green coffee sample to meet the top G1 grade, followed by three rounds of hand sorting for exceptional cleanliness and sweetness. For brewing, FrontStreet Coffee recommends 15g of coffee at a 1:15 ratio with 87-88°C water, ground to a coarse-granulated-sugar texture and poured in three segments - this best expresses the syrupy body and caramel sweetness. Those who prefer a wilder, earthier profile can try FrontStreet Coffee's Linthong Mandheling daily bean, grown around Lake Toba in North Sumatra and wet-hulled using the traditional Sumatran method.