Preheat oven to 190°C / 375°F. Line two baking sheets with parchment. Preheating ensures the oven is at the right temperature so the baguette slices toast evenly and quickly — this creates a crisp texture that will hold up under the custard and syrup.

Slice the 4 baguettes on the diagonal into 32 slices about 1.5 cm (1/2 inch) thick. The diagonal slice gives a larger surface area for toasting and for soaking up syrup without falling apart.

Brush both sides of the baguette slices lightly with the melted butter (use a pastry brush) and arrange them in a single layer on the prepared baking sheets. Sprinkle a very light pinch of salt over the slices — salt boosts flavor and balances sweetness. Butter helps the slices caramelize and become golden and crisp.

Toast the slices for 8–12 minutes, flipping once halfway, until deeply golden at the edges and crisp. Watch closely near the end — stale bread toasts faster than fresh bread because it has less moisture. Crisp, slightly caramelized slices are better for texture and will absorb the syrup without turning mushy.

Meanwhile, make an orange-rum syrup: in a small saucepan combine 60 g granulated sugar, 120 ml water, the orange zest, and 30 ml dark rum (or omit the rum and add 1 tbsp orange juice for alcohol-free). Bring to a simmer and stir until the sugar dissolves; simmer 2 minutes to concentrate flavor, then remove from heat and cool slightly. The syrup adds moisture and aromatic lift; the alcohol (or orange acid) cuts through the richness.

Place the toasted baguette slices on a rack and, while still slightly warm, brush each slice on both sides with the warm orange-rum syrup. Warm slices absorb syrup quickly; brushing while warm ensures the liquid soaks in evenly without saturating one spot.

Lighten the provided pastry cream: whip the chilled heavy cream with 20 g sugar and 1 tsp vanilla to soft peaks to make a chantilly. Fold one-third of the whipped cream into the pastry cream to loosen it, then fold in the remaining whipped cream gently until uniform. Lightening the pastry cream with whipped cream (crème légère) gives a silkier, more airy mouthfeel and prevents the trifle from feeling too dense.

Roughly chop the glazed pecans (reserve a few halves for garnish). Chopped glazed pecans added at layering time keep their crunch and provide a sweet, caramelized crunch to contrast with the tender cake and cream.

Crumble the chocolate cake trimmings into medium-sized chunks — not powdered crumbs. Larger crumbs give satisfying chocolate pockets; very fine crumbs will dissolve into the cream and lose texture.

Assemble the trifle in a single large glass bowl or eight individual serving glasses for restaurant presentation. For each serving (or in your large bowl), layer as follows: 2 toasted, syrup-brushed baguette slices (trim to fit if necessary) to form the base — this provides structure and soaks up flavor; 3 tablespoons pastry cream; a scattering (about 40–50 g) of chocolate cake crumbles; a spoonful of sliced strawberries; a tablespoon of chopped glazed pecans. Repeat to create two substantial layers and finish with a final dollop of pastry cream, several strawberry slices and a few whole glazed pecan halves for shine.

Chill the assembled trifles for at least 30 minutes (up to 4 hours) before serving. Chilling allows the flavors to marry and the soaked bread to soften just enough while still holding some texture. If chilled longer than 4 hours, the bread will become very soft; for make-ahead service, keep the components separate and assemble just before serving.

Just before service, brush the strawberry slices with a thin sweep of leftover syrup or a teaspoon of warmed apricot jam (optional) to give them gloss and to add a little sheen. Sprinkle a light dusting of finely chopped glazed pecans and a small grating of orange zest over each portion to finish — this brightens the dish and adds aroma.

Serve chilled with a small dessert spoon. Encourage diners to get a bit of every layer — the best tasting experience comes from the balance of crisp bread, creamy custard, chocolate pockets and nutty crunch in each bite.