Why pesto works for spirulina
The flavour chemistry of pesto is ideal for masking spirulina:
- Fat binding:Olive oil and pine nuts contain long-chain fatty acids that physically encapsulate the volatile dimethyl sulphide compounds responsible for spirulina’s sea-like taste. The flavour compounds are trapped in lipid micelles and never reach the olfactory receptors at effective concentrations.
- Dominant aromatics:Fresh basil contains eugenol, linalool, and methyl chavicol — potent aromatic compounds that overwhelm subtler flavours. Garlic adds allicin, another dominating compound. Together they occupy the remaining sensory bandwidth spirulina might otherwise fill.
- Colour integration:Basil pesto is already green. Adding spirulina deepens the green to a vivid jewel tone — it looks like a richer pesto, not an algae supplement.
- No heat:Pesto is made at room temperature. Phycocyanin, which degrades above 60°C, is fully preserved.
Classic spirulina basil pesto
Serves 4 (approximately 2.5 g spirulina per person). Preparation time: 10 minutes.
- 60 g fresh basil leaves
- 40 g pine nuts (toasted)
- 40 g Parmesan, finely grated
- 2 garlic cloves
- 80 ml extra virgin olive oil
- 10 g spirulina powder
- Juice of half a lemon
- Salt to taste
Blend basil, pine nuts, Parmesan, and garlic to a rough paste. Add olive oil gradually while blending. Add lemon juice and spirulina. Blend briefly — 10–15 seconds. Season with salt. The lemon acid helps bind and mellow the spirulina flavour.
Toss with 400 g cooked linguine or spaghetti. The pasta should be slightly cooled before adding pesto (below 60°C) to preserve phycocyanin. A splash of pasta cooking water creates the emulsified sauce.
Walnut spirulina pesto (no pine nuts)
Walnuts are a budget substitute with a stronger flavour that further masks spirulina. Use 40 g toasted walnuts in place of pine nuts. Add 1 tsp nutritional yeast if making dairy-free (replaces some of the parmesan umami).
This version works particularly well with wholegrain pasta or in pasta salads — the walnut bitterness complements the earthy green tones.
Avocado spirulina pesto
For a creamier, dairy-free version — particularly effective at masking spirulina because of the high fat content of avocado:
- 1 ripe avocado
- 30 g fresh basil
- 2 garlic cloves
- Juice of 1 lemon
- 2 tbsp olive oil
- 8 g spirulina powder
- Salt and black pepper
Blend until smooth. Serve immediately — avocado pesto oxidises within 2–3 hours. The higher fat content from avocado (vs olive oil only) binds spirulina volatiles particularly effectively. This version contains approximately 2 g spirulina per serving for 4.
Spirulina pasta dough (optional)
For fresh pasta, spirulina can be incorporated directly into the dough for a vivid green colour. Note: phycocyanin degrades during boiling, so this is primarily aesthetic — the protein, iron, and mineral content of spirulina is heat-stable and remains in the dough.
- 200 g ’00’ flour or semolina
- 2 eggs
- 5 g spirulina powder
- 1 tsp olive oil
- Pinch of salt
Mix spirulina into flour before adding eggs. Knead for 8–10 minutes until smooth and elastic. Rest 30 minutes, then roll and cut as desired. The dough is a vivid blue-green before cooking; it shifts to a muted olive-green after boiling — normal and expected.
Spirulina in cream-based pasta sauces
A surprisingly effective use case: add 5 g spirulina to a cream sauce (crème fraîche or double cream) with lemon zest, garlic, and peas. The dairy fat binds the spirulina volatiles, and lemon brightens the flavour. Serve below 60°C after removing from heat. Works as a substitute for spinach in creamy pasta dishes — the flavour is different but not unpleasant when the sauce is balanced correctly.
Storage
- Classic basil pesto: refrigerate in an airtight jar with olive oil covering the surface (prevents oxidation). Use within 5 days.
- Avocado pesto: use within a few hours or freeze in portions
- Freeze pesto in ice cube trays — 12 cubes per batch, defrost individual portions as needed. Phycocyanin survives freezing intact.
