How to Dial In Espresso at Home

This Is How We Actually Make Espresso

Not theory. Not "roughly around this." These are the exact recipes we use at the BOM roastery, pulled from our brew timer. Same numbers our team uses to quality-check every batch we roast.

If you've got an espresso machine at home and you're guessing your way through each shot, this will fix that. Espresso isn't magic. It's ratios, weight, and time. Get those three right and you'll pull better shots than most cafes.

The Only Three Numbers That Matter

Dose: How much ground coffee goes in (grams).

Yield: How much liquid comes out (grams).

Time: How long the shot takes (seconds).

That's it. Temperature helps too, but dose, yield, and time are where 90% of your espresso quality lives. You need a scale. Not a fancy one. A $20 kitchen scale that reads to 0.1g is fine. If you're making espresso without weighing, you're flying blind.

BOM's Espresso Recipes

Here's what we run for each of our blends. Use these as your starting point.

Notice the pattern? As the roast gets darker, the dose drops slightly, the ratio tightens, and the temperature comes down. That's not random. There's a reason for it.

Why Darker Roasts Need Less Everything

This is something most home baristas don't know. Darker roasted coffee is more soluble. The longer roasting process breaks down more of the cell structure, so hot water extracts flavour faster and easier.

That means darker roasts need cooler water and less of it (relative to the dose) to hit the sweet spot. Push too much water through a dark roast at high temperature and you'll extract all the bitter compounds you're trying to avoid.

That's why Hyperdrive runs at 90°C with a 1:1.8 ratio while People Every Day runs at 93°C with a 1:2. Same time window. Completely different extraction approach.

If your machine lets you adjust brew temperature, use this. If it doesn't, don't stress. Adjust your ratio and grind instead. You'll still get 80% of the way there.

The Steps (Every Single Time)

1. Weigh your dose. Grind into the portafilter and weigh it. Hit your target number from the table above. Scrape off or add a touch if you're over or under.

2. Distribute and tamp flat. Give the portafilter a few gentle taps on the bench to settle the grounds, then tamp. Here's the thing about tamping: it's about level, not force. You don't need to lean on it like you're doing CPR. A firm, flat press is all it takes. Uneven tamp is what kills shots, not soft tamp.

3. Flush the group head. Run water through the group head for 2 seconds before you lock in the portafilter. This clears old coffee residue and stabilises the temperature. Takes 2 seconds. Skipping it is the easiest way to add bitterness to an otherwise good shot.

4. Lock in and extract. Put your cup on the scale, zero it, start the shot, and watch the weight climb. Stop the shot when you hit your target yield. Time should land between 27 and 30 seconds.

5. Read the flow. This is the visual check that tells you everything. Look for honey-coloured flow. Thick, steady, golden. If it's gushing out pale and watery, your grind is too coarse. If it's dripping out dark and slow, your grind is too fine. Adjust one click at a time.

The Golden Rule

Honey-coloured flow. That's the whole game. If your shot looks like honey dripping off a spoon, you're in the zone. Everything else is fine-tuning.

Gushing = grind finer. Dripping = grind coarser. Commit that to memory and you'll fix 80% of bad shots in one adjustment.

Troubleshooting: What Your Shot Is Telling You

Common Mistakes We See All the Time

Not weighing the output. Timing alone is not enough. A 28-second shot could yield 30g or 45g depending on your grind. Those are completely different cups. Weight is the truth. Time is the guide.

Skipping the group head flush. Old grounds and temperature instability live in that group head between shots. Two seconds of water fixes both. Do it every time.

Tamping like it's a workout. We see people putting their whole body weight into it. All you need is a flat, even surface. 15kg of pressure is plenty. Focus on keeping it level. Channelling (water finding gaps in the puck) comes from uneven tamps, not soft ones.

Using old beans. Coffee is a fresh product. It's at its best between 7 and 30 days off roast. After 6 weeks, the oils are stale and no amount of recipe tweaking will save the shot. Every bag of BOM coffee has the roast date on it. Use it.

One More Thing Only Roasters Talk About

New bags need a day to settle. When coffee is freshly roasted (under 5 days), it's still degassing CO2. That gas interferes with extraction and makes shots unpredictable. You'll see the puck bubble and the shot will run fast no matter how fine you grind.

If you just got a fresh bag and the shots are weird, give it 2 more days. It's not you. It's chemistry.

Start Pulling Better Shots

Grab one of our blends and try these recipes exactly as written. Start with People Every Day if you're new to dialling in. It's the most forgiving and runs a clean 1:2 ratio that works on almost any machine. Once you've nailed it, try No Sleep or Hyperdrive and taste the difference a recipe change makes with a darker roast.