How to Choose Prawns by Size: Medium, Large or Jumbo?
Walk up to any prawn display in Karachi and the first question is not really "which prawns?" but "which size?". Size decides how quickly prawns cook, how much masala each piece carries, how many pieces end up on every plate and how much cleaning you will do at home. This guide explains how to match size to dish, with a focus on why Medium Prawns are the sensible default for most family cooking.
Why Prawn Size Matters More Than You Think
Prawns of different sizes are often the same kind of animal, simply at different stages of growth. What changes is the ratio of surface to meat. A smaller prawn has more surface for its weight, so it soaks up marinade fast and cooks through in moments. A bigger prawn has a thicker body, stays juicy for longer over high heat and gives a meatier bite, but needs more care to cook evenly.
That is why the "best" size is never a fixed answer. A prawn that is perfect on a BBQ skewer can feel like too much in a spoonful of biryani, and a prawn that disappears nicely into fried rice may fall through the grill bars at a rooftop BBQ.
A Simple Size-to-Dish Guide
| Size grade | Best for | Why it works |
|---|---|---|
| Medium | Everyday karahi, jhinga pulao, biryani, fried rice, pakoras, soups | Several pieces per spoonful, quick cooking, easy to mix through rice and batter |
| Large | Prawn masala, butter garlic prawns, tempura, chilli prawns | Each prawn is a proper bite, holds its shape in thick gravies and batters |
| Jumbo | Grilling, BBQ skewers, tandoori, showpiece platters | Thick bodies stay juicy over open flame and look impressive whole |
If you are planning a grill night, read our guide to buying prawns for BBQ and grilling. For restaurant-style gravies and fried starters, Large Prawns are usually the better pick.
When Medium Prawns Are the Right Choice
Rice dishes: pulao, biryani and fried rice
In a pot of jhinga pulao you want prawns spread evenly through the rice, so every plate gets its share. Medium prawns do exactly that. Large pieces tend to cluster and can overcook during the dum, while medium ones finish gently in the steam and stay tender.
Weeknight prawn karahi
A home-style karahi with tomatoes, green chillies and ginger is about the masala as much as the prawns. Medium prawns coat well, cook in a few minutes once the masala is ready and are easy to eat with naan or roti without cutting.
Pakoras and snacks
For prawn pakoras, medium prawns are close to ideal. They fit inside a spoonful of besan batter, cook through in the time it takes the coating to crisp, and you get plenty of pieces for an iftar plate or a rainy-evening tray with chai.
Soups and noodles
In hot and sour soup, prawn and vegetable broth or chow mein, smaller prawns blend into the dish rather than dominating it. They also cook in the simmering liquid without needing a separate step.
How to Check Prawns for Quality
Whatever size you buy, the signs of good prawns are the same. When you have a chance to see them, look for:
- Smell: a mild, clean smell of the sea. A sharp, ammonia-like or sour smell is a clear warning sign.
- Shell: shells that sit snugly on the body and look glossy, not dry, cracked or loose.
- Heads: on whole prawns, heads should be firmly attached. Heads that are turning very dark or separating easily suggest older stock.
- Flesh: firm and slightly springy when pressed, translucent rather than chalky or mushy.
- Surface: moist but never slimy or sticky.
For peeled prawns, the flesh should look glossy and even in colour, with no grey, dried edges and no strong smell when you open the pack.
Choosing the Right Cut
Medium Prawns are offered in three cuts, and the right one depends on your time and your recipe:
- Whole (shell-on): the most traditional. Choose this if you like to make stock from heads and shells for pulao yakhni or soup. Remember that heads and shells account for a large share of the weight, so you will need more by weight for the same amount of meat.
- Headless (shell-on): a good middle ground. The shell protects the meat, and peeling at home just before cooking keeps the prawns at their juiciest.
- Peeled and Deveined: the time-saver. For karahi, fried rice and pakoras, where you need many small prawns cleaned, this saves a lot of fiddly work.
Seasonality in General Terms
Prawn catches along the Sindh and Balochistan coast vary through the year with weather, sea conditions and fishing seasons, so the sizes and quantities available can change. Rather than relying on a fixed calendar, ask FishMart for today's stock and which grades are available when you plan to cook.
What to Specify When Ordering Online
- The dish you are cooking. Saying "prawn pulao for six" helps more than a weight alone.
- The cut. Whole, Headless (shell-on) or Peeled and Deveined.
- The quantity of cleaned meat you need. If you choose whole prawns, allow extra weight for heads and shells.
- Whether you plan to freeze. If so, consider shell-on prawns and freeze them in meal-sized bags as soon as they arrive.
- Any questions about availability. Check the product page or contact FishMart if a grade or cut is not listed.
Common Mistakes to Avoid
- Buying the biggest prawns for every dish. Jumbo prawns are wonderful on the grill, but in biryani they can be awkward to eat and easy to overcook.
- Forgetting shell weight. Whole prawns give noticeably less meat than the weight on the scale.
- Overcooking. Medium prawns need only minutes. Add them at the end of a karahi or salan.
- Thawing on the counter. Always thaw in the fridge and cook promptly.
- Cooking wet prawns. Pat them dry so they sear and coat properly instead of stewing.
The Bottom Line
For most weekday cooking – karahi, pulao, fried rice, pakoras and soup – medium is the size that balances bite, convenience and value for the whole family. Save large prawns for masala and butter garlic dishes, and jumbo for the grill. When you are ready, choose your cut on the Medium Prawns page, or browse the whole Prawns & Shrimp section to compare grades side by side.
Frequently asked questions
Is a bigger prawn always better quality?
No. Size is a grade, not a quality mark. A medium prawn in good condition is better than a jumbo prawn that has been poorly handled. Choose the size that suits your dish.
Which prawn size is best for biryani?
Medium prawns usually work best because they spread evenly through the rice and finish gently during the dum without turning tough.
How much extra should I order if I buy whole prawns?
Heads and shells make up a large part of the weight, so order noticeably more by weight than you would for peeled prawns. If unsure, tell FishMart the dish and number of people and ask for guidance.
Can I use medium prawns in a recipe that calls for large prawns?
Yes, but reduce the cooking time. Smaller prawns cook through faster, so add them later and check them sooner.
