Preheat the oven to 400F. Using a bread knife, slice the baguette into 1-inch thick slices, about 12-14 of them. Brush the baguette slices with olive oil on one side and place in a single layer on a baking sheet. Toast for 10 minutes total, flipping halfway through. Set aside.
For the roasted grapes
While the crostini is baking, prepare the grapes: on a sheet pan lined with parchment paper, toss the grapes with balsamic vinegar, olive oil, salt and pepper.
When the crostini is done cooking, roast the grapes in the oven for about 15-17 minutes until grapes are softened and the grapes begin to burst. Set the grapes aside to cool for a few minutes before making the crostini.
For the ricotta
Mix the ricotta with lemon zest and honey and set aside.
To assemble each crostini, spread about 1 tbsp of ricotta mixture on crostini, spoon a few grapes on top of the ricotta and fnish with a bit of fresh thyme or rosemary.
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Notes
If you want to add an extra crunch to these crostini, try adding a sprinkle of chopped walnuts.