Grapes East Calder: Easy Roasted Grape Crostini

“Grapes East Calder” is interpreted here as an easy grape recipe: roasted grapes served warm on crisp crostini with whipped ricotta, herbs and a little balsamic. Roasting concentrates the fruit’s sweetness while the creamy cheese and tangy vinegar keep each bite balanced, making this a simple starter or snack.

Ingredients

1 lb seedless red or black grapes (450 g), removed from the stems
1 tablespoon olive oil (15 ml), plus 1 teaspoon (5 ml) for the bread
1 tablespoon balsamic vinegar (15 ml), plus extra to finish if desired
¼ teaspoon fine salt (1.5 g)
⅛ teaspoon freshly ground black pepper (about 0.3 g)
1 baguette, about 12 oz (340 g), cut into 18 slices about ½ inch (1.25 cm) thick
1 cup whole-milk ricotta (250 g)
1 teaspoon finely grated lemon zest (about 2 g)
1 tablespoon chopped fresh thyme leaves (about 3 g), divided
1 tablespoon honey (15 ml), plus more to serve if desired
2 tablespoons chopped toasted walnuts (about 15 g), optional

Instructions

Heat the oven to 400°F (200°C). Line a rimmed baking sheet with parchment paper. Rinse the grapes under cool running water, remove any stems, and dry them thoroughly; wet grapes can steam instead of roast.
Put the grapes on the baking sheet and toss with 1 tablespoon (15 ml) olive oil, the balsamic vinegar, salt and pepper. Spread them out in a single layer. Roast for 20–25 minutes, stirring once halfway through, until the skins begin to wrinkle and some grapes have split. The fruit should be soft and juicy but not collapsed into a purée. Set the pan aside to cool slightly while you toast the bread.
Arrange the baguette slices on a second baking sheet. Brush or drizzle them lightly with the remaining 1 teaspoon (5 ml) olive oil. Toast at 400°F (200°C) for 6–8 minutes, turning once, until crisp at the edges and lightly golden. Watch closely near the end, as thin slices can brown quickly. If the oven is occupied, toast the slices in batches in a skillet over medium heat instead.
While the bread toasts, stir together the ricotta, lemon zest, half of the thyme and honey in a small bowl. Taste and add a pinch of salt if needed. For a smoother, fluffier spread, beat the mixture vigorously with a spoon or whisk for about a minute.
Let the toast cool for a minute so it stays crisp under the topping. Spread each slice with ricotta, then spoon on a few warm grapes and some of their pan juices. Finish with the remaining thyme and, if using, toasted walnuts. Add a light drizzle of balsamic or honey to taste and serve promptly.

Tips

Dry the grapes well. Excess water makes them more likely to steam and can dilute the flavorful juices on the tray. Use seedless grapes for easy eating; if yours contain seeds, halve them and remove the seeds before roasting.
Choose ripe, firm fruit. Red or black grapes give a deep, sweet flavor, while green grapes taste brighter and more tart. If using very sweet grapes, reduce or omit the honey; if the fruit is tart, add a little more after roasting.
Keep the bread crisp. Assemble just before serving because the ricotta and grape juices soften toast over time. For a less messy appetizer, serve the components separately and let guests build their own.
Make the walnuts optional. Toast them in a dry skillet over medium-low heat for 3–5 minutes, stirring often, until fragrant. Remove them promptly; nuts can go from toasted to burnt quickly.

Serving Suggestions

Serve the crostini as a starter, party snack or part of a light lunch. They pair well with a green salad dressed with lemon vinaigrette, a bowl of soup, or a cheese board with aged cheddar or a mild blue cheese. For a larger gathering, offer the roasted grapes, ricotta and toast separately so guests can assemble their own portions and the bread remains crunchy.

For a more substantial appetizer, add a few paper-thin slices of prosciutto on top of the ricotta before adding the grapes. The salty cured meat complements the fruit, but the crostini are satisfying without it. Use a sturdy serving platter and bring the grapes to the table warm or at room temperature.

Variations

Use goat cheese: Replace the ricotta with 6 oz (170 g) soft goat cheese mixed with 2 tablespoons (30 ml) plain yogurt. This makes a tangier, firmer base; add the yogurt gradually until spreadable.
Try another herb: Swap thyme for 1 tablespoon (about 3 g) chopped rosemary or 2 tablespoons (about 5 g) chopped fresh basil. Rosemary is more assertive, so start with half the amount and add to taste.
Make it nut-free: Leave out the walnuts and finish with extra thyme, black pepper or a few pumpkin seeds. Check packaged toppings for cross-contact warnings if serving someone with a serious allergy.
Serve as a bowl topping: Roast the grapes as directed and spoon them over ricotta in a shallow bowl. Serve with toasted bread for dipping, or use them to top a grain bowl with greens and toasted seeds.

Storage and Reheating

For best texture, store the roasted grapes, ricotta mixture and toasted bread separately. Refrigerate the grapes and ricotta in covered containers within 2 hours of cooking or serving. They keep for up to 3–4 days in the refrigerator; discard them if left at room temperature longer than 2 hours, or 1 hour when the temperature is above 90°F (32°C). Keep the bread in an airtight container at room temperature for up to 2 days.

Reheat the grapes in a small covered ovenproof dish at 325°F (165°C) for about 8–10 minutes, or microwave them in short bursts until warmed through. Re-crisp bread in a 350°F (175°C) oven for 3–5 minutes. Avoid reheating assembled crostini, since the toast will become soggy. Assemble only the portions you plan to serve.

Frequently Asked Questions

Can I use green grapes?
Yes. Seedless green grapes roast well and have a sharper, less jammy flavor than red or black grapes. Taste them after roasting and adjust the honey or balsamic to balance their tartness.

Can I roast the grapes ahead of time?
Yes. Roast them up to 3 days ahead and refrigerate them in a covered container. Warm gently before serving, or serve them at room temperature. Make the ricotta mixture ahead too, but toast the bread and assemble the crostini close to serving time.

What can I use instead of ricotta?
Soft goat cheese, whipped cream cheese or thick strained yogurt can work. Goat cheese is tangier, cream cheese is richer, and yogurt is more tart and less firm. Adjust the honey and lemon to suit the substitute.

Do I need to prick the grapes before roasting?
No. The grapes can roast whole; some skins will split naturally as the fruit softens. Pricking them is unnecessary and may let too much juice escape before they begin to caramelize.

How do I keep the crostini from getting soggy?
Toast the bread until crisp, allow it to cool briefly, and assemble just before serving. Keep the grapes’ juices on the fruit rather than spooning a large puddle onto each slice. Serving the components separately is best if they will sit out for a while.

Can I make this without an oven?
Yes. Cook the grapes in a covered skillet over medium-low heat with the oil, balsamic, salt and pepper for about 10–15 minutes, stirring occasionally, until softened and some have burst. Toast the bread in a dry skillet over medium heat, turning once.

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