Mediterraneo's Grilled-Vegetable Sandwich

This is restaurant-style sandwich engineering, the open-faced kind that arrives on a wooden board with a knife and fork rather than wrapped in deli paper. Each slice of grilled walnut bread layers up with three distinct elements that hit different flavor zones: nutty hummus-tahini spread on the bottom, char-grilled vegetables in the middle, and a sharp shallot-Dijon vinaigrette drizzled across the top.

The vegetable lineup is intentional. Portobellos bring meaty texture, fennel adds anise sweetness, zucchini and yellow squash give tender bulk, and bell peppers bring char-blistered sweetness. Cutting them all to similar ¼-inch thickness means they cook at the same rate on the grill.

Three separate olive oil applications keep this from feeling like a one-note sandwich. Pure olive oil for cooking and brushing, extra virgin for the dressing where the flavor comes through. Don’t substitute one for the other: heat dulls extra virgin’s complexity, and pure oil is too neutral to carry a vinaigrette.

Chef Tips

• Get the grill hot enough to leave dark sear marks. Lukewarm vegetables steam-cook into mush instead of charring.
• Press the portobellos flat with a spatula while grilling for even color and to release excess water.
• Toast the bread last, after the vegetables come off, so it stays warm and crisp under the toppings.
• Build the sandwiches just before serving. Vegetables weep and bread softens fast.

Variations

• Add grilled eggplant slices for a heartier, more substantial sandwich.
• Spread with pesto instead of hummus for a different Italian angle.
• Top with crumbled feta or fresh mozzarella for added protein and creaminess.
• Use a baguette and serve as smaller crostini-style appetizers.