Perilla / Shiso — Cups to Grams

Measuring Shiso: Whole Leaves vs. Chiffonade

Shiso leaves are large (typically 6-12cm across), thin, and irregularly shaped with a serrated edge. Their measurements are unusual among herbs — most culinary uses specify leaves by count (2 leaves, 5 leaves) rather than by volume, and gram weights are rarely given in Japanese recipes. The cup measurements here are primarily useful for Western recipe conversions and meal prep scaling.

Whole leaves, loose (22g/cup): Large shiso leaves placed loosely without folding into a standard 240ml measuring cup. The leaves create significant air space due to their irregular shape. A single large leaf (8-10cm) weighs approximately 1.5-2g; a medium leaf (5-7cm) weighs approximately 0.8-1.2g. One cup loosely filled equals approximately 12-20 medium leaves.

Chiffonade, packed (38g/cup): Thin ribbon-cut shiso pressed into the cup eliminates most air gaps, producing a 73% higher weight per cup than whole loose leaves. This is the form used as a garnish over cold noodle dishes, sashimi platters, and rice bowls where visual texture and aroma are both desired.

Green Shiso vs. Red Shiso: Two Varieties, Different Uses

Perilla frutescens var. crispa encompasses several cultivated varieties distinguished primarily by leaf color, which signals different chemical compositions and culinary applications. The two most important are ao-jiso (green) and aka-jiso (red/purple).

Ao-jiso (green shiso): The standard culinary variety used fresh in Japanese cooking. Bright green, slightly ruffled leaves with a lighter, more aromatic, fresh-herbaceous flavor dominated by perillaldehyde. This is the variety used for sashimi, tempura, onigiri, shiso rice, and cold noodle garnishes. When Western recipes call for "shiso" without specification, ao-jiso is implied.

Aka-jiso (red shiso): Deep purple-red leaves with a more intense, slightly bitter, complex flavor. Significantly higher in anthocyanin pigments (the source of its color) and with a different balance of volatile compounds — less perillaldehyde, more rosmarinic acid. Aka-jiso is used primarily for coloring umeboshi (pickled plums red), making shiso vinegar, and producing the base for yukari (dried red shiso seasoning). Unlike ao-jiso, it is rarely eaten fresh.

A third variety, chirimen-jiso, has particularly crinkled leaves and is prized as a garnish in high-end kaiseki cuisine for its visual texture. Egoma (Perilla frutescens var. frutescens), the Korean equivalent used as kkaennip (perilla leaf wraps), is botanically distinct but similar in flavor and nearly identical in culinary function.

Using Shiso in Japanese and Asian Cooking

Shiso is one of the most frequently used fresh herbs in Japanese cuisine, appearing across appetizers, mains, garnishes, and condiments. Its heat-sensitive volatile compounds mean it is almost always added raw or at the very end of cooking to preserve its distinctive aroma.

Sashimi and sushi: Large ao-jiso leaves (8-10cm) are placed under sashimi slices as a fragrant bed. The leaf is not always eaten but provides an aromatic foundation and visual contrast. In hand rolls (temaki), 1-2 leaves are placed inside the nori with rice and fish. In nigiri and maki with shiso, the herb is placed between the fish and rice or nori.

Shiso tempura: One of the simplest Japanese preparations. Large whole leaves are dipped on one side only in light tempura batter (100g cold water + 50g flour, barely mixed) and fried at 175°C for 30-45 seconds per side until the batter is just set and lightly golden. The leaf side remains visible through the thin batter. Serve immediately — shiso tempura loses crispness within 2-3 minutes.

Cold noodle dishes: Chiffonade shiso (3-5 ribbons per bowl) is a classic garnish for hiyashi chuka (cold ramen with toppings), zaru soba (cold buckwheat noodles with dipping sauce), and cold tofu (hiyayakko). The herb's aromatic oils perfume the dish without being incorporated into sauces or broths.

Storing Fresh Shiso and Why Drying Fails

Shiso's exceptional aroma comes from perillaldehyde, a volatile aldehyde that evaporates rapidly at temperatures above 40°C and is largely destroyed by drying processes. This makes shiso fundamentally different from thyme, rosemary, or oregano, where drying concentrates rather than destroys the key flavor compounds.

The best fresh storage method treats shiso like cut flowers. Trim the stem ends at an angle, place in a glass with 2-3cm of water, loosely cover with a plastic bag to reduce transpiration, and keep at room temperature (18-22°C) away from direct sunlight. Change the water every 1-2 days. Stored this way, shiso lasts 5-7 days with minimal quality loss. If refrigeration is necessary, use the warmest zone (door shelf) and wrap loosely in damp paper towel — never seal tightly, as excess moisture and cold accelerate blackening.

For preservation beyond a week, the most practical method is shiso oil: blend 50g fresh leaves with 100ml neutral oil, strain, and refrigerate up to 2 weeks or freeze in ice cube trays for 3 months. The oil captures some volatile compounds and works well as a finishing drizzle for cold dishes and sashimi.