High-Density Fiber Power
Flank Steak & Skirt Steak High-Density Protein Calculator
Grass-fed Flank Steak delivers an impressive 6.60g of protein per raw ounce (23.3g/100g), concentrating to 8.8g per cooked ounce (31.0g/100g). A standard 1-pound (16 oz) raw flank steak provides 105.6g of complete protein and over 8.9g of bioavailable L-leucine.
Carved from the abdominal wall (rectus abdominis), Flank Steak consists of thick, dense muscle fiber bundles that absorb marinades deeply and deliver intense primal beef flavor when sliced across the grain.
🔥 Sonoran Sliced Asada & Flank
Sonoran Style Carne Asada & Grass-Fed Flank: High-Protein Fiesta Fuel
Perfect for tacos, fajitas, and athlete meal prep. Our 100% grass-fed Flank and Skirt steaks pack concentrated amino acids and robust beefy flavor that sears into crispy perfection over open flame.
105g+ Protein per 1 lb Flank
Ultra-dense whole muscle protein with under 27g natural pasture lipids.
Absorbs Citrus Marinades
Thick fiber architecture pulls in lime, garlic, and sea salt for maximum flavor.
100% Regenerative Pasture Raised
Zero grain finishing, zero feedlot confinement, zero chemical additives.
100% Grass-Fed & Pasture-Raised • Flash-Frozen at Peak Freshness • Zero Added Hormones
Shop Sonoran Asada & Flank
Rectus Abdominis Muscle Architecture
Flank features large, coarse muscle fibers running parallel along the length of the steak. This open grain structure acts like a capillary sponge for marinades while holding intense savory umami.
Perpendicular Carving Biophysics
Carving flank steak at a strict 90° angle across the grain cuts through longitudinal muscle bundles, reducing bite resistance by over 60% and transforming a dense cut into tender culinary bliss.
Flank Steak Portion & Slicing Reference Table
| Raw Flank Weight | Cooked Mass | Total Protein | Natural Fat | Total Calories | Protein / Slice (8 Slices) |
|---|---|---|---|---|---|
| 8 oz Raw Cut | 6.2 oz (176g) | 52.8 g | 13 g | 330 kcal | 6.6 g / slice |
| 12 oz Raw Cut | 9.4 oz (266g) | 79.2 g | 20 g | 496 kcal | 9.9 g / slice |
| 16 oz (1 lb Standard) | 12.5 oz (354g) | 105.6 g | 27 g | 661 kcal | 13.2 g / slice |
| 24 oz (1.5 lb Large) | 18.7 oz (530g) | 158.4 g | 40 g | 992 kcal | 19.8 g / slice |
Master Asada High-Heat Sear & Carving Rules
- 1. Sear at High Heat (500°F+): Flank is thin and lean. Cook over intense direct flame or screaming-hot cast iron for just 3 to 4 minutes per side to achieve a charred exterior while keeping the center medium-rare.
- 2. Mandatory 45° Angle Bias Carving: Angle your knife at 45° to slice broad, thin ribbons across the grain, maximizing bite tenderness.
- 3. Finish with Flaky Sea Salt & Lime: Squeeze fresh lime juice over warm sliced ribbons; the acid enhances salivary response and amplifies iron bioavailability.
Chef & Nutritionist Troubleshooting Protocol
Issue: Flank steak slices feel rubbery and tough
Cause: Sliced parallel along the grain instead of across it. Fix: Look closely at the grain lines and slice at a strict 90° right angle across the fibers.
Issue: Flank turning gray and overcooked inside
Cause: Skillet was not hot enough, causing prolonged cooking. Fix: Preheat cast iron to 500°F and flash-sear for 3 minutes per side max.
Frequently Asked Questions
How much protein is in a 1 lb flank steak?
A 16 oz (1 lb) raw grass-fed flank steak contains 105.6g of pure protein and ~8.9g of bioavailable L-leucine.
What is the difference between Flank Steak and Skirt Steak?
Flank steak is from the abdominal wall and is wider, leaner, and thicker. Skirt steak is from the diaphragm and has higher intramuscular fat, looser grain structure, and a faster sear time.
Is flank steak good for weekly meal prep?
Flank steak is one of the premier meal prep cuts because its dense grain structure retains moisture and tenderness even when refrigerated and reheated.
Get 100% Grass-Fed Flank & Sonoran Asada
Upgrade your taco nights and meal prep with pasture-raised, high-protein Flank and Skirt steaks delivered directly to your kitchen.
100% Grass-Fed & Finished
Zero Hormones or Grain Feed
Rancher-Direct Flash Frozen Delivery
