These crostini are the kind of recipe I turn to when I want something that feels special but actually takes very little time. Crisp slices of baguette brushed with olive oil, a creamy smear of hummus, a whisper of pesto, and a bright, herby tuna topping come together with confident, straightforward flavors. They work as an appetizer, a light lunch, or a snack for a small gathering.

You can assemble these in about 20 minutes if you plan carefully: while the toasts bake, make the tuna mix and chiffonade your basil. The recipe is forgiving on presentation but specific on a couple of technique points—slice the bread thin, and drain most of the oil from the tuna—so the final bite stays balanced and crisp.

Below you’ll find a clear shopping list, a precise ingredients section, step-by-step directions from the test kitchen, and practical notes on storage, common issues, and seasonal twists. I’ve tested this exact sequence to keep results reliable and repeatable.

Shopping List

Buy a thin baguette, a couple of cans of quality canned tuna in olive oil, fresh basil, and a lemon. You’ll also need hummus and pesto—store-bought is perfectly fine here—or use what you already have on hand. Olive oil, salt, and pepper are pantry basics you’ll use to dress the bread and season the tuna. The rest is about choosing fresh basil and a good tuna brand packed in olive oil for flavor and texture.

Ingredients

1 thin baguette — the base for the crostini; slice thin on the diagonal so each bite is crisp without being bready.
1/4 cup olive oil — used to brush the toasts so they brown evenly and stay crisp.
2 cans Genova Tonno Solid Light Tuna in Olive Oil — the main protein; the oil adds flavor, but you’ll drain most of it before mixing.
2 tablespoons chopped fresh basil — folded into the tuna for fresh, aromatic lift.
1/4 cup chiffonade fresh basil leaves (optional garnish) — a finishing flourish that flavors each bite and looks sharp.
1 tablespoon freshly squeezed lemon juice or more to taste — brightens and balances the tuna; adjust to your preference.
salt and freshly ground black pepper, to taste — seasons the tuna and lifts the whole crostini.
1 cup hummus — the creamy layer that keeps the tuna from making the toast soggy and adds savory depth.
1/3 cup pesto — used sparingly on top of the hummus for an herb-forward contrast; a little goes a long way.

Method: Mediterranean Tuna Hummus Crostini

Preheat oven to 400°F (200°C).
Using a serrated knife, slice the thin baguette on the diagonal into 1/4-inch slices. Do not slice thicker than 1/4 inch.
Arrange the slices in a single layer on a baking sheet. Brush the top of each slice with the 1/4 cup olive oil.
Bake the slices 8–10 minutes, until the bottoms are golden brown and the edges are crisp. Flip one slice to check doneness—the bottoms will brown more than the tops. Remove from oven and let the toasts cool slightly.
While the bread toasts, prepare the tuna mixture: open the 2 cans Genova Tonno Solid Light Tuna in Olive Oil and drain most of the oil. Place the tuna in a mixing bowl and flake with a fork.
Add 2 tablespoons chopped fresh basil, 1 tablespoon freshly squeezed lemon juice, and salt and freshly ground black pepper to taste to the tuna. Mix until well combined.
To assemble each crostini, spread about 1 1/2 teaspoons hummus on a toast, then add about 1/2 teaspoon pesto on top of the hummus.
Top each crostini with about 1/2 tablespoon of the tuna mixture.
Garnish with the 1/4 cup chiffonade fresh basil leaves, if desired, and serve immediately.

Why This Recipe Is Reliable

This formula is built around clear contrasts: crunchy toasted bread, creamy hummus, and a bright, fragmented tuna topping. That structure makes it forgiving. The timing is modest—8–10 minutes in the oven for the toast—and the tuna is handled simply so texture and flavor remain the stars.

Two technique points keep the result consistent. First, slicing the baguette at 1/4 inch ensures each crostini stays crisp and light; thicker slices trap moisture and feel heavy. Second, draining most of the tuna oil prevents soggy toasts while retaining enough flavor. Those small rules control the outcome more than any precise seasoning level.

What to Use Instead

If you don’t have Genova Tonno, any solid light tuna in olive oil works. Packed-in-water tuna will make a leaner topping; if you use it, add a touch more olive oil to the mix for mouthfeel. If basil is scarce, a tablespoon of finely chopped parsley will add freshness, though the flavor changes.

For hummus and pesto, store-bought versions are fine. Swap the pesto for sun-dried tomato spread if you want a richer, tangier twist. Use vegetarian “tuna” alternatives sparingly: they can be dryer, so increase the lemon or a splash of olive oil to compensate.

Gear Checklist

Rimmed baking sheet — for even toasting and catching any drips.
Serrated knife — essential for clean, non-squashed baguette slices.
Mixing bowl and fork — to flake and combine the tuna mixture.
Spoon or small offset spatula — for spreading hummus and placing pesto precisely.
Citrus juicer or reamer (optional) — squeezes lemon cleanly without seeds.

Frequent Missteps to Avoid

Slicing the bread too thick will produce heavy, chewy crostini that don’t support the toppings well. Stick to 1/4-inch slices as directed. Over-oiling the bread leaves the texture limp—brush, don’t soak. When draining the tuna, leave a little oil for flavor; draining it completely will make the mixture dry.

A common seasoning mistake is under- or over-salting before tasting. The hummus and pesto already contain salt; add salt to the tuna sparingly, tasting as you go. Finally, assembling everything too far ahead of serving makes the toasts lose their crispness. Assemble just before serving for the best texture.

Fresh Takes Through the Year

Spring: Add thinly sliced radishes or cucumber as a crisp, peppery finish. They add a cool crunch that pairs well with basil and lemon.

Summer: Use a basil-forward pesto made with extra lemon or swap in a quick tomato concassé (seeded diced tomatoes tossed with olive oil and salt) for a brighter, juicier topping.

Autumn/Winter: Substitute parsley and a touch of capers into the tuna for a brinier edge, or finish with a small drizzle of chili oil for warmth. Roast red peppers can also act as a sweet, smoky pesto alternative.

Notes from the Test Kitchen

We tested this exact sequence multiple times to lock in timing and proportions. The 8–10 minute bake time was consistent across conventional ovens. If your oven runs hot or you’re using a thin sheet pan that browns quickly, check at 7–8 minutes and rotate the sheet if necessary.

The ratio of hummus to pesto matters: the hummus anchors the pesto so it doesn’t overwhelm the tuna. Using 1 1/2 teaspoons hummus and 1/2 teaspoon pesto per toast gives balance and keeps the crostini tidy. We also found chiffonading the basil and adding it as the final garnish preserves its color and aroma—add it too early and it wilts.

Cooling, Storing & Rewarming

Store toasted slices and the tuna mixture separately. Toasts, once fully cooled, keep for up to 48 hours in an airtight container at room temperature—if you seal them well they stay crisp. The tuna mixture keeps refrigerated in an airtight container for up to 2 days.

To refresh slightly stale toasts, re-crisp them in a 350°F (175°C) oven for 4–6 minutes. Do not assemble crostini and reheat; added hummus and tuna will soften the bread. Assemble only right before serving for the best texture.

Quick Q&A

Can I make these ahead? You can prep the tuna mixture up to 24–48 hours ahead and keep it chilled. Toasts should be baked and stored separately and assembled right before serving.

What if I don’t have pesto? Use a small spoonful of extra virgin olive oil with a pinch of crushed garlic and a few chopped basil leaves, or swap in a sun-dried tomato spread for a different flavor profile.

Are these suitable for a crowd? Yes. Multiply the ingredients and scale baking across pans. Toast the bread in batches and keep assembled elements separate until service.

Final Bite

This Mediterranean Tuna Hummus Crostini is a simple, dependable recipe that reads elegant on a platter but comes together with minimal fuss. Keep the technique tight—thin slices, drained tuna, measured spreads—and the flavors will stay clean: creamy hummus, bright lemon-basil tuna, and a hint of pesto. Serve them warm, assemble them close to service, and enjoy the way small, precise choices make a casual recipe feel deliberately good.